Fighting for the Cause of Allah (Jihaad)
حَدَّثَنِي عُبَيْدُ بْنُ إِسْمَاعِيلَ، عَنْ أَبِي أُسَامَةَ، عَنْ عُبَيْدِ اللَّهِ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ عَنِ النَّبِيِّ صلى الله عليه وسلم. أَنَّهُ كَانَ إِذَا أَدْخَلَ رِجْلَهُ فِي الْغَرْزِ وَاسْتَوَتْ بِهِ نَاقَتُهُ قَائِمَةً، أَهَلَّ مِنْ عِنْدِ مَسْجِدِ ذِي الْحُلَيْفَةِ.Narrated Ibn'`Umar:When the Prophet (ﷺ) put his feet in the stirrup and the she-camel got up carrying him he would start reciting Talbiya at the mosque of Dhul-Hulaifa
From Sahih al-Bukhari, whose reports the scholars accept as authentic.