Hadith 3:45
Ibn ‘Umar reported ‘Umar b. al-Khattab as saying, “A kiss is connected with sexual intercourse, so perform ablution on that account.”
وَعَن ابْن عُمَرَ أَنَّ عُمَرَ بْنَ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُ قَالَ: إِن الْقبْلَة من اللَّمْس فتوضؤوا مِنْهَا
Original Reference: Mishkat al-Masabih 332