At-Talaaq 65:1

O Prophet, when you [believers] divorce women, divorce them with concern to their waiting period and keep an accurate count of the waiting period[1], and fear Allah, your Lord. Do not force them out of their houses, nor should they leave unless they commit a clear shameful act. Such are the limits ordained by Allah. Whoever transgresses the limits ordained by Allah has truly wronged himself. You never know, perhaps Allah will bring about a change [of heart] later[2].

[1] A wife should only be divorced after the completion of her monthly cycle and before sexual intercourse after purity, or else during a confirmed pregnancy. Her waiting period (‘iddah) begins with the pronouncement of divorce. See 2:228-233.
[2] Such as regret for divorcing or renewed desire for the wife.

O Prophet, when you [Muslims] divorce women, divorce them for [the commencement of] their waiting period and keep count of the waiting period,[1697] and fear Allāh, your Lord. Do not turn them out of their [husbands'] houses, nor should they [themselves] leave [during that period] unless they are committing a clear immorality. And those are the limits [set by] Allāh. And whoever transgresses the limits of Allāh has certainly wronged himself. You know not; perhaps Allāh will bring about after that a [different] matter.[1698]

[1697] See rulings in 2:228-233. A wife should not be divorced except after the completion of her menstrual period but before sexual intercourse has occurred, or else during a confirmed pregnancy. The pronouncement of divorce begins her waiting period (ʿiddah).
[1698] Such as regret or renewed desire for the wife.

1. O Prophet (صلى الله عليه وسلم)! When you divorce women, divorce them at their ‘Iddah (prescribed periods) and count (accurately) their ‘Iddah (periods[1]). And fear Allâh your Lord (O Muslims). And turn them not out of their (husband’s) homes nor shall they (themselves) leave, except in case they are guilty of some open illegal sexual intercourse. And those are the set limits of Allâh. And whosoever transgresses the set limits of Allâh, then indeed he has wronged himself. You (the one who divorces his wife) know not it may be that Allâh will afterward bring some new thing to pass (i.e. to return her back to you if that was the first or second divorce).

[1] (V.65:1) Narrated ‘Abdullâh bin ‘Umar رضي الله عنهما that he had divorced his wife while she was menstruating during the lifetime of Allâh’s Messenger صلى الله عليه وسلم . ‘Umar bin Al-Khattâb رضي الله عنه asked Allâh’s Messenger صلى الله عليه وسلم about that. Allâh’s Messenger صلى الله عليه وسلم said, "Order him (your son) to take her back and keep her till she is clean from her menses and then to wait till she gets her next period and becomes clean again, whereupon, if he wishes to keep her, he can do so, and if he wishes to divorce her he can divorce her before having sexual intercourse with her; and that is the ‘Iddah (prescribed period) which Allâh has fixed for the women meant to be divorced." (Sahih Al Bukhari, Vol.7, Hadîth No.178).

O Prophet! When ye (men) put away women, put them away for their (legal) period and reckon the period, and keep your duty to Allah, your Lord. Expel them not from their houses nor let them go forth unless they commit open immorality. Such are the limits (imposed by) Allah; and whoso transgresseth Allah's limits, he verily wrongeth his soul. Thou knowest not: it may be that Allah will afterward bring some new thing to pass.