Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: A man came to the Prophet (peace and blessings be upon him) and said: "O Messenger of Allah, I pronounced zihar on my wife, then last night her anklet pleased me, and I had marital relations with her before making the expiation." The Messenger of Allah (peace and blessings be upon him) said: "Has Allah, the Mighty and Majestic, not said: 'before they touch one another' [Surah al-Mujadilah: 3]? Refrain until you have made the expiation."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10841