It was narrated that Ibn 'Abbas (رضي الله عنه) said: On the day of al-Khandaq, a mushrik man was killed and they asked the Prophet (ﷺ) to let them bury him, and he said:

"No, not at all [I cannot please you by doing that]." They said: We will give you something in return for that. He said: "That is even worse."