Umm Salama bint Abu Umaya reported,

She said, the Messenger of Allah ﷺ said, "Whoever has a sacrifice to offer, once the crescent of Dhul-Hijjah appears, he must not take anything from his hair or his nails until he sacrifices."

Azami 7155

Sahih

عن أم سلمة زوج النبي ﷺ

قالت: قال رسول الله ﷺ من كان له ذبح يذبحه، فإذا أهل هلال ذي الحجة، فلا يأخذن من شعره، ولا من أظفاره شيئا حتى يضحي.

الأعظمي 7155صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Sacrificial animals
Section
Prohibition of cutting hair and trimming nails when the ten days of Dhul-Hijjah begin
Numbering
Jami al-Kamil 7155 (2nd edition)
Azami 7155