مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3760
Musnad of Abdullah bin Mas'ood
It was narrated from 'Abdur-Rahman bin 'Abdullah bin Mas'ood (رضي الله عنه), that his father said: The Messenger of Allah (ﷺ) forbade two transactions in one. Aswad said: Shareek said: Simak said: A man makes a sale and says: The price on credit is such and such and the price if paid on the spot is such and such.
Musnad Ahmad 3783Saheeh because of corroborating evidence. This is a da'eef i