Musnad Ahmad 30:2891

'Abd al-Rahman ibn Mahdi narrated to us, he said: Hammad ibn Salamah narrated to us, from Muhammad ibn Ziyad, he said: I heard Abu Hurairah saying: I heard Abu al-Qasim, may Allah bless him and grant him peace, saying: "The child belongs to the owner of the bed, and for the fornicator is the stone."