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