Voluntary charity ("sadaqah") is not mandatory. Therefore, according to Islamic law, it is perfectly legitimate to limit one's charitable contribution to mandatory charity only ("zakaat").
It is not me who made the rules. — alcontali
Did I once ask you what the rules say?
I asked you why you chose to err on the side of doing as little as you can get away with. I didn't ask you how little you can get away with. I asked you why you do not advise doing more, contrary to the advice of your religion.
(Let him who has 'ilm give sadaqah from his 'ilm. Let him who has wealth give sadaqah from his wealth.) [Ibn Sunni]
(Charity increases one’s life span. Sadaqah wipes out sins and protects one against awful death.) [Tabarani]
(Sadaqah wipes out arrogance.) [Tirmidhi]
(The rizq of a giver of sadaqah increases, and his du’a is accepted.) [Ibn Majah]
(Curse be upon him who prevents one from giving sadaqah.) [Isfahani]
(Sadaqah protects one from the torment in the grave. It takes one under protection on the Day of Resurrection.) [Bayhaqi]
(Avert your troubles with sadaqah.) [Daylami]
(Sadaqah wipes out sins just as water extinguishes fire.) [Tirmidhi]
(By Allah, giving sadaqah does not decrease wealth. Then give sadaqah.) [Imam-i Ahmad]
(Sadaqah increases wealth. Then give sadaqah.) [Ibn Abiddunya]
(Sadaqah averts 70 types of problems, the least of which is
leprosy and alphos.) [Hatib]
(Sadaqah cripples Shaitan.) [Daylami]
(Sadaqah given in secret extinguishes the wrath of Allah.) [Bayhaqi]
(Whoever gives sadaqah purely in pursuit of Allah’s pleasure, Allahu ta’ala will say to him on the Day of Resurrection, “O My slave, you pursued My pleasure, so I will not make you despicable, and I will make your body haram for Hell. Enter Paradise from any door you like.”) [Daylami]
(Give sadaqah even if it is little. Allah stops His favors on someone who conceals his money and does not give it.) [Muslim]
(Whoever wants abundant rizq, let him give sadaqah.) [Daylami]
(Make your rizq abundant by giving sadaqah.) [Bayhaqi]
(Sadaqah increases wealth.) [Ibn Adiy]
(Hurry to give sadaqah because trouble cannot pass before sadaqah.) [Tabarani, Bayhaqi]
(Give sadaqah because it is a means for your salvation from Hell.) [Tabarani]
(Give sadaqah even if it is a single date because it, though little, satisfies hunger and wipes out sins just as water extinguishes fire.) [Ibn Mubarak]
(Giving sadaqah in the beginning of a day averts calamities.) [Daylami]
(Sadaqah is more virtuous than observing a voluntary fast.) [Bayhaqi]
(If one gives sadaqah by intending its thawab for one’s Muslim parents, its thawab goes to them. There will be no decrease in one’s own thawab.) [Tabarani]
(A piece of bread given as sadaqah grows like the size of Mount Uhud in the sight of Allah.) [Tabarani]
Question: I have heard that we should give sadaqah every day. What should one do if one does not have any money?
ANSWER
Our Master the Messenger of Allah and the Blessed Companions had the following talk. Our Master the Messenger of Allah said:
- Every Muslim has to give sadaqah.
- O the Messenger of Allah, if someone cannot find anything to give, what should one do?
- One should work, earn, and give sadaqah.
- If one cannot find work?
- One should help someone in need in any way possible.
- If one cannot find anyone to help?
- One’s doing any beneficial deed is a sadaqah for one [for example, one’s saying “If I had money, I would give it in charity,” giving directions, removing something harmful from a pathway, remembering death, avoiding harming others, learning and teaching 'ilm]. (Bukhari, Muslim, Nasai)