Sayyiduna Ibn Umar (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) said: "When you place your dead in their graves, say: 'Bismillah, wa 'ala sunnati Rasulillah' (In the name of Allah, and upon the Sunnah (way) of the Messenger of Allah (peace and blessings be upon him))." This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it. Hammam bin Yahya is a reliable and trustworthy narrator; when he narrates such a hadith as marfu' (attributed to the Prophet), it is not rendered defective by someone else narrating it as mawquf (stopping at the Companion), while Shu'bah narrated it as mawquf:

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that whenever he placed a deceased person in the grave, he would say: 'Bismillah, wa 'ala sunnati Rasulillah' (In the name of Allah, and upon the Sunnah of the Messenger of Allah (peace and blessings be upon him)). The hadith of al-Bayadi, who is well known among the Companions, is a supporting narration (shahid) for the musnad hadith of Hammam from Qatadah.