And Zaid bin Thabit (may Allah be pleased with him) said that by performing the prayer, you have fulfilled your duty. Humaid bin Hilal (Tabi'i) said that after performing the funeral prayer, we do not consider it necessary to seek permission (to leave). Whoever performs the funeral prayer and then returns, he receives the reward of one qirat.

Narrated Sulaiman Ash-Shaibani: I heard Ash-Shu`bi saying, "A person who was accompanying the Prophet passed by a grave that was separated from the other graves told me that the Prophet once led the people in the (funeral) prayer and the people had aligned behind him. I said, "O Aba `Amr! Who told you about it?" He said, "Ibn `Abbas."