Musannaf Ibn Abi Shayba 23:207

Yazid ibn Harun narrated to us, he said: Hammad ibn Salamah informed us, from Abu Ja'far al-Khatmi, from 'Umarah ibn Khuzaymah ibn Thabit, from his father, that he saw in a dream as if he were prostrating upon the forehead of the Messenger of Allah, may Allah bless him and grant him peace. He mentioned that to the Messenger of Allah, may Allah bless him and grant him peace. The Messenger of Allah, may Allah bless him and grant him peace, said: "Indeed, the soul meets the soul," or he said: "The soul meets the soul" (Yazid was in doubt). Then the Messenger of Allah, may Allah bless him and grant him peace, lowered his head, then he commanded him, so he prostrated from behind him upon the forehead of the Messenger of Allah, may Allah bless him and grant him peace.