Allāhumma laka aslamt, wa bika āmant, wa ‘alayka tawakkalt, wa ’ilayka anabt, wa bika khāsamt. Allāhumma inni a‘ūdhu bi‘izzatika, la ilāha illa ant, an tudillani. Anta al-hayyu alladhi la yamūt, wal-jinnu wal-insu yamūtūn. (O Allah, I surrender to You, I believe in You, I rely upon You, to You I repent, and with Your help I dispute. I seek refuge in Your Might. There is no god but You, that You do not lead me astray. You are the Ever-Living Who never dies, but the Jinn and humans die)

عَنِ ابْنِ عَبَّاسٍ رَضيَ اللهُ عنهما أَنَّ رَسُولَ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ كَانَ يَقُولُ: «اللهُمَّ لَكَ أَسْلَمْتُ، وَبِكَ آمَنْتُ، وَعَلَيْكَ تَوَكَّلْتُ، وَإِلَيْكَ أَنَبْتُ، وَبِكَ خَاصَمْتُ، اللهُمَّ إِنِّي أَعُوذُ بِعِزَّتِكَ، لَا إِلَهَ إِلَّا أَنْتَ أَنْ تُضِلَّنِي، أَنْتَ الْحَيُّ الَّذِي لَا يَمُوتُ، وَالْجِنُّ وَالْإِنْسُ يَمُوتُونَ».

Ibn ‘Abbās (may Allah be pleased with him and his father) reported that the Messenger of Allah (may Allah's peace and blessings be upon him) used to say: "Allāhumma laka aslamt, wa bika āmant, wa ‘alayka tawakkalt, wa ’ilayka anabt, wa bika khāsamt. Allāhumma inni a‘ūdhu bi‘izzatika, la ilāha illa ant, an tudillani. Anta al-hayyu alladhi la yamūt, wal-jinnu wal-insu yamūtūn. (O Allah, I surrender to You, I believe in You, I rely upon You, to You I repent, and with Your help I dispute. I seek refuge in Your Might. There is no god but You, that You do not lead me astray. You are the Ever-Living Who never dies, but the Jinn and humans die)."

Source · Narrated by Al-Bukhāri and Muslim; this is the wording of Muslim, and Al-Bukhāri narrated a summarised version

From the Hadith Encyclopedia (hadeethenc.com).