An-Nisaa 4:15

Those of your women who commit adultery, call four witnesses against them[12] from amongst you. If they testify, confine them to their homes until they die or Allah ordains for them [another] way[13].

[12] The witnesses must swear to actually having seen the act taking place.
[13] The provision of this verse has been abrogated by the verse of Surat an-Nūr (24:2), ordaining lashing for the unmarried and stoning to death for the married.

Those who commit immorality [i.e., unlawful sexual intercourse] of your women - bring against them four [witnesses] from among you. And if they testify,[169] confine them [i.e., the guilty women] to houses until death takes them or Allāh ordains for them [another] way.[170]

[169] The witnesses must swear to actually having seen the act taking place.
[170] The "other way" (i.e., penalty) was later revealed in 24:2, canceling the ruling in this verse.

15. And those of your women who commit illegal sexual intercourse, take the evidence of four witnesses from amongst you against them; and if they testify, confine them (i.e. women) to houses until death comes to them or Allâh ordains for them some (other) way.[4]

[4] (V.4:15) The provision of this Verse has been abrogated by the Verse of Sûrat An-Nûr (V.24:2), ordaining lashing for the unmarried and stoning to death for the married, when four witnesses testify to the crime.

As for those of your women who are guilty of lewdness, call to witness four of you against them. And if they testify (to the truth of the allegation) then confine them to the houses until death take them or (until) Allah appoint for them a way (through new legislation).