Ya'la bin Ubayd (may Allah have mercy on him) said: Al-A'mash (may Allah have mercy on him) narrated the hadith to us and mentioned something similar, and he said: I placed my hand on him (peace and blessings be upon him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6532