Ayesha reported,

I imitated a man in front of the Prophet ﷺ, and he said, "It would not please me to imitate someone, even in exchange for such and such."She said, I then said, "Messenger of Allah, Safiyyah is a woman," and she gestured with her hand as if to indicate that she was short.He said, "You have spoken a word that, were it mixed with the water of the sea, would taint it."

Tirmidhi 2502

Sahih

حدثنا محمد بن بشار حدثنا يحيى بن سعيد وعبد الرحمن بن مهدي قالا حدثنا سفيان عن علي بن الأقمر عن أبي حذيفة وكان من أصحاب ابن مسعود

عن عائشة قالت

حكيت للنبي ﷺ رجلا فقال ما يسرني أني حكيت رجلا وأن لي كذا وكذا قالت فقلت يا رسول الله إن صفية امرأة وقالت بيدها هكذا كأنها تعني قصيرة فقال لقد مزجت بكلمة لو مزجت بها ماء البحر لمزج

الترمذي 2502صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami Tirmidhi
Book
Description of the Resurrection, softening of hearts, and piety from the Messenger of Allah ﷺ
Chapter
Hadith, "If seawater were mixed with it…"
Numbering
Darussalam 2502
Tirmidhi 2502