A sister just got a call, she was hired to join a big company with very good salary… Some other sisters who were listening her conversation they saying ta’bir [ Allah is great].. Hamdallah.. praise Allah..
The first thing that they said to that sister was . “Alhamdulillah Allah give you chance to give more for charity…”
There is a beautiful hadist that was narrated by Abu Dharr radiyallahuan  [one of companion who was very poor]… Abu Dharr said some of Companions [poor companions] came to Rasulullah sallahu alahi wassalam… they want to share their complaint/their envy about the rich people [among the other companions]…
They said :
“They [their rich brothers] observe prayer as we do, they keep the fasts as we keep them, and they give sadaqah from their surplus riches. “
At this point those poor companions felt some steps behind the rich companions because they do not have money to do charity like Rich companions do…..
Upon this Rasulullah sallahu alaihi wassalam said:
“Has Allah not prescribed for you (a course) by following which you can (also) do sadaqah?
In every declaration of the glorification of Allah (i.e. saying SubhanAllah) there is a sadaqah,
every Takbir (i.e. saying AllahuAkbar) is a sadaqah,
every praise of Him (saying Alhamdulillah) is a sadaqah,
every declaration that He is One (La ilaha illallah) is sadaqah,
enjoining of good is a sadaqah,
forbidding of that which is evil is a Sadaqah,
and in man's sexual intercourse (with his wife) there is a Sadaqah.
According to sharah of this hadist [the tafseer of the hadist], after heard that hadith Prophet companions were very happy… They went home and practice what Rasulullah sallahu alaihi wassalam advised…. They increase did tasbih, takbir, tahmid wish Allah account them as Sadaqah.
Somehow rich companions knew this hadith… they hastily practice what poor companions had been practicing too…
Those poor companions came to met Rasulullah again. They said Rasulullah sallahu alaihi wassalam that rich companions also practice his advice…
Upon this matter… Rasulullah sallahu alaihi wassalam was smiled and said that the benefit .. that Allah bless toward the rich people… 
It was wonderful.. long time ago.. at the time of Rasulullah.. the companions always race to do righteous deeds..They competed in the good way, tried to find ways how to please Allah more.
The poor asked Rasulullah how to be equal like the rich companions in the sight of Allah…. When the Rich companions knew the advice of Rasulullah to their fellow poor brothers, they also didn’t want to lost the chance to do more righteous deeds that can make them better in the sight of Allah subhana wata'ala…
The spirit to race in the goodness made the poor companions met Rasulullah sallahu alaihi wassalam again... wish Rasulullah could say any other advice to make them leading in righteous deeds… wallahu alam…
They raced to do righteous deeds as much as possible… it’s not strange at that time ....rich companions gave most of their wealth for charity….Abu Bakr As Siddiq gave all his wealth, Ustman bin Afan bought the well for Moslem…Abdurrahman bin Auf donated all his merchandise….They were conglomerate who always spend their wealth in the way of Allah…
Rasulullah sallahu alaihi wassalam never disappointed the poor companions from Abu Huraira radiyallahuan was reported Rasulullah sallahu alaihi wassalam said
"Every bone of men's fingers and toes must give sadaqa every day the sun rises.
If one gives justice between two men it is sadaqa;
if one helps a man with his beast, loading or lifting his goods on it, it is sadaqa;
a good word is sadaqa;
every step one takes towards prayer is sadaqa;
and if anyone removes anything injurious from the road it is sadaqa." 
Poor companions..... at that time...... never use their poverty as the reason to left behind in righteous deeds.. They asked Rasulullah sallahu alaihi wassalm what kind righteous deeds that they can do to please Allah subhana wata’ala..
So...one of the reason why Moslem should be rich… to give more charity… to be able to do more of things with his money to please Allah.. to spend it in the way of Allah… To spend our money first to help our close people….like what Allah says : “They ask thee what they should spend (In charity). Say: Whatever ye spend that is good, is for parents and kindred and orphans and those in want and for wayfarers. And whatever ye do that is good, -(Allah) knoweth it well “.
There is a hadist that record by Iman Al Bukhari . One of beloved companion Rasulullah sallahu alihiwassalm - Saad bin Abi Waqqas was striken by an ailment that lead him to the verge of death. The prophet sallahu alaihi wassalam came to visit him. When Saad Radiyallah an saw Rasulullah there was an interesting conversation between them…
Saad said : "O Allah's Apostle! I have much property and no heir except my single daughter. Shall I give two-thirds of my property in charity?"
Rasuluallah sallahu alaihi wassalam said : "No."
Saad said : "Half of it?"
Rasuluallah sallahu alaihi wassalam said : "No."
Saat said, "One-third of it?"
Rasuluallah sallahu alaihi wassalam said: "You may do so, though one-third is also too much, for it is better for you to leave your offspring wealthy than to leave them poor, asking others for help. And whatever you spend (for Allah's sake) you will be rewarded for it, even for a morsel of food which you may put in the mouth of your wife."
The last answer of prophet sallahu alaihi wassalam is another reason why Moslem should be rich….. that was said it’s better we leave our offspring wealthy than to leave them poor asking other for help….
The rich people lead forward than the poor. Rasulullah sallahu alaihi wassalam forbid us to be envy except to the rich people who spend their money in the way of Allah.. and people who have knowledge and they teach it to other.
May Allah subhana wata’ala help all of us always to be strong financially then we can follow our role model salafussholeh who always race in the good deeds….
May Allah open our heart to feel the same joy like our role model salafus sholeh when we see the bigger amount of money that we have to spend for the zakah and infaq.
May Allah help us to get rid our greedy to keep money just to enrich ourselves when there are many people who direly need them.
May Allah guide our heart to spent our wealth in the way of Allah to safe us from the grievous Penalty "O ye who believe! Shall I lead you to a bargain that will save you from a grievous Penalty?- That ye believe in Allah and His Messenger, and that ye strive (your utmost) in the Cause of Allah, with your property and your persons: That will be best for you, if ye but knew! 
Say: "Truly, my prayer and my service of sacrifice, my life and my death, are (all) for Allah, the Cherisher of the Worlds:
Wallahu alam bishshowab….
Subhanakallahumma wabihamdika ashadu ala ilaha illa anta astaghfiruka wa atubu ilaika
Wassallammu’alaikum warohmatullahi wabarokatuh
Fi aman Allah
9 March 2006
 Sahih Muslim Hadith 2198 Narrated by AbuDharr
 I said this part with my own…
 HR Bukhari and Muslim
 Qur’an Al Baqarah 2:215
 Sahih Al-Bukhari Hadith 8.725Nrrated by Saad bin Abi Waqqas
 Qur'an As Saff 61:10-11
 Qur'an Al An'am 6:162