'Abdullah bin Yazid Al-Khatmi (May Allah be pleased with him) reported:
When Messenger of Allah (ﷺ) intended to bid farewell to his army he would say: "Astau-di'ullaha dinakaum, wa amanatakum, wa khawatima 'amalikum (I entrust Allah with your Deen, your trust and your last deeds)."[Abu Dawud].
App reference: Book 2, Hadith 36
Arabic/English book reference: Book 2, Hadith 716