مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2823
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn ‘Abbas (رضي الله عنه) said: The Prophet (ﷺ) instructed the one who had intercourse with his wife when she was menstruating to give a dinar, or half a dinar, in charity.
Musnad Ahmad 2843Saheeh Mawqoof]