'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]. (ID)
App reference (ID): Book 2, Hadith 36 (ID)
Arabic/English book reference (ID): Book 2, Hadith 716 (ID)