"I was next to Zaid bin Arqam when he was asked: 'How many battles did the Prophet (ﷺ) fight ?' He said: 'Nineteen.' So I said: 'How many battles did you take part in with him ?' he said: 'Seventeen.' I said: 'Which of them was the first?' He said: 'Dhat Al-Ushaira' or Al-'Usaira'. '"
[Abu 'Eisa said:] This Hadith is Hasan Sahih.
Reference: Jami` at-Tirmidhi 1676 In-book : Book 23, Hadith 7 English translation : Vol. 3, Book 21, Hadith 1676
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