Translation:

15. If any of your women are guilty of lewdness take the evidence of four (reliable) witnesses from amongst you against them; and if they testify confine them to houses until death do claim them or Allah ordain for them some (other) way.

Notes (Tafseer)

523. Most commentators understand this to refer to adultery or fornication; in that case they consider that the punishment was altered by the later verse, xxiv. 2.

524. To protect the honor of women, stricter evidence is required, i.e., the evidence of four instead of the usual two witnesses. It is the same for adultery (see xxiv. 4.).

525. Keep them in prison until some definite order is received. Those who take the crime to be adultery or fornication construe this definite order ("some other way") to mean some definite pronouncement by the Prophet under inspiration; this was the punishment of flogging under xxiv. 2, for fornication, and stoning to death under the Prophet's directives for adultery.