Abu Marthad reported,

I heard the Messenger of Allah ﷺ say, "Do not pray facing graves, and do not sit upon them."

Azami 2626

Sahih

عن أبي مرثد الغنوي قال

سمعت رسول الله ﷺ يقول: لا تصلوا إلى القبور، ولا تجلسوا عليها.

الأعظمي 2626صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Prayer
Chapter
What is prohibited and disliked in prayer
Section
Places where prayer is forbidden
Numbering
Jami al-Kamil 2626 (2nd edition)
Azami 2626