Jami` at-Tirmidhi, Volume 6, Book 45, Hadith 3443 (DarusSalam) ⓘ
Salim narrated that : when he intended to undertake a journey, Ibn `Umar used to say to a person to “Come close to me so that I may bid you farewell as the Messenger of Allah used to bid us farewell.” Then he would say: “I entrust to Allah your religion, and your trusts, and the last of your deeds (Astawdi`ullāha dīnaka wa amānataka wa khawātīma `amalik).”
حَدَّثَنَا إِسْمَاعِيلُ بْنُ مُوسَى الْفَزَارِيُّ، حَدَّثَنَا سَعِيدُ بْنُ خُثَيْمٍ، عَنْ حَنْظَلَةَ، عَنْ سَالِمٍ، أَنَّ ابْنَ عُمَرَ، كَانَ يَقُولُ لِلرَّجُلِ إِذَا أَرَادَ سَفَرًا ادْنُ مِنِّي أُوَدِّعْكَ كَمَا كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يُوَدِّعُنَا . فَيَقُولُ " أَسْتَوْدِعُ اللَّهَ دِينَكَ وَأَمَانَتَكَ وَخَوَاتِيمَ عَمَلِكَ " . قَالَ هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ غَرِيبٌ مِنْ هَذَا الْوَجْهِ مِنْ حَدِيثِ سَالِمِ بْنِ عَبْدِ اللَّهِ .
also referenced under: Hadith 3443 (Reference) & Book 48, Hadith 74 (In-Book)