That is why...
That is why, immediately after that, Allah says: “…You do not know them, (but) We know them…” This indication, of course, is to the ordinary and common knowledge of the Prophet (S), but there is no contrust that he (S) becomes utterly aware of their secrets through Divine revelation and by His teaching.
At the end of the verse, the Qurān announces the grievous punishment of this group as follows: “…Soon We will punish them twice, then they will be turned back to grievous chastisement…” Twice in punishment is, at first, their disgraces among people, and the other is to give up their lives with hardship which includes both their spiritual and bodily chastisements.
Verily Allah is Forgiving, Merciful.”*** Several persons from among the companions of the Prophet (S) refrained from taking part in the Battle of Tabūk, not hypocritically, of course, but for the sake of loving life. When the concerning critical verses were revealed, they regreted and, as a sign of repentance, they had fastened themselves on a pillar in the Prophet’s Mosque.
They kept on being in that state until when Allah accepted their repentance and the Messenger of Allah (S) unfastened the ropes from them and they were forgiven. The verse says: “And (there are) othes who have confessed to their sins. They have mixed a righteous deed and an evil one. Maybe Allah will turn (mercifully) to them (and accept their repentance).
“Take alms out of their possessions to cleanse them and purify them thereby, and pray for them, surely your prayers are a comfort for them, and Allah is All-Hearing, All-Knowing.”*** This holy verse points to one of the important Islamic ordinances, viz. alms.