Jami` at-Tirmidhi 3442

Ibn Umar narrated, saying:“When the Prophet (ﷺ) would bid farewell to a man, he would take his hand, and not let it go until the man let go of the hand, of the Prophet, and he would say: ‘I entrust to Allah your religion, your trusts, and the last of your deeds (Astawdi`ullāha dīnaka wa amānataka wa ākhira `amalik).’”