Musannaf Ibn Abi Shaybah 12054 — Reports on what is said when

When Mujahid placed the deceased in the grave, he would say: 'Bismillahi wa fi sabilillah, Allahumma afsih lahu fi qabrihi, wa nawwir lahu fihi, wa alhiqhu bi-nabiyyihi (peace and blessings be upon him), wa anta 'anhu radin ghayru ghadban' (In the name of Allah and in the path of Allah. O Allah, make his grave spacious for him, illuminate it for him, join him with his Prophet (peace and blessings be upon him), and be pleased with him, not angry).