Maliks Muwatta Book 2, Hadith Number 66.

Section : Wudu on Account of a Man Kissing His Wife.

Yahya related to me from Malik from Ibn Shihab from Salim ibn Abdullah that his father Abdullah ibn Umar used to say, “A man’s kissing his wife and fondling her with his hands are part of intercourse. Someone who kisses his wife or fondles her with his hand must do wudu.”