Surah Al-Mujadilah 58:3
ﱰ ﱱ ﱲ ﱳ ﱴ ﱵ ﱶ ﱷ ﱸ ﱹ ﱺ ﱻ ﱼ ﱽ ﱾ ﱿ ﲀ ﲁ ﲂ ﲃ ﲄ ﲅ ﲆ
And those who pronounce thihar from their wives and then [wish to] go back on what they said - then [there must be] the freeing of a slave before they touch one another. That is what you are admonished thereby; and Allah is Acquainted with what you do.