That the Prophet (ﷺ) said: "Whoever sees the crescent of Dhul-Hijjah, and wants to slaughter a sacrifice he should not take from his hair nor from his nails."
Reference: Jami` at-Tirmidhi 1523 In-book : Book 19, Hadith 36 English translation : Vol. 3, Book 17, Hadith 1523
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