Reminder given by: Abu Abdullah Khalif
Hadith:
1706. Umm Salamah (May Allah be pleased with her) said: The Messenger of Allah (sallallaahu alayhi wa sallam) said, “When anyone of you intends to sacrifice the animal and enter in the month of Dhul-Hijjah, he should not get his hair cut or nails pared till he has offered his sacrifice.”
[Muslim].
Source: https://abdurrahman.org/2014/09/04/riyad-us-saliheen-imaam-nawawi-chapter-313/