Surah 47. Muhammad, Ayah 36

Although the life of this world is "but a play and a passing delight", God does not want to deprive the believers of its rightful enjoyment: and so He expects them to sacrifice only a small part of their possessions in His cause. This passage evidently foreshadows the imposition of the obligatory annual tax called zakah ("the purifying dues"), amounting to about 22 percent of a Muslims's income and property, as pointed out by most of the classical commentators in connection with the above verse (hence my interpolation). The proceeds of this tax are to be utilized in what the Qur'an describes as "the cause [lit., "way"] of God", i.e., for the defence and propagation of the Faith and the welfare of the community; and its spiritual purpose is the "purification" of a Muslim's possessions from the blemish of greed and selfishness. (It is to be noted that the payment of zakah was made obligatory at the very beginning of the Medina period, that is, at approximately the same time as the revelation of the present surah.)

Cf. vi. 32, and n. 855; and xxix. 64, and n. 3497. Amusement and play are not bad things in themselves. As preparations for the more serious life, they have their value. But if we concentrate on them, and neglect the business of life, we cannot prosper. So we must use our life in this world as a preparation for the next life.

Complete self-sacrifice, if voluntarily offered, has a meaning: it means that the person's devotion is exclusively and completely for the Cause. But no law or rule can demand it. And a mere offer to kill yourself has no meaning. You should be ready to take risks to your life in fighting for the Cause, but you should aim at life, not death. If you live, you should be ready to place your substance and your acquisitions at the disposal of the Cause. But it is not reasonable to pauperise yourself and become a hanger-on for the Cause. Moreover, the inborn tendency to self-preservation in an average man would lead to concealment and niggardliness if all were asked for the Cause, by Law, and there would further be a feeling of bitterness and rebellion.