I am pleased with Allah as my Lord, with Islam as my religion, and with Muhammad (peace and blessing...

Reference:Allah has promised that anyone who says this three times every morning or evening will be pleased on the Day of Resurrection. Ahmad 4/ 337, An-Nasa'i, 'Amalul-Yawm wal-Laylah p. 4, Ibn As-Sunni (no. 68), At-Tirmidhi 5/465. Its chain of transmission is good (Hasan), Ibn Baz, p. 39.Hisnul Muslim 87

رَضيـتُ بِاللهِ رَبَّـاً وَبِالإسْلامِ ديـناً وَبِمُحَـمَّدٍ نَبِيّـاً .

Transliteration

Raḍītu billāhi Rabba. wa bil-Islāmi dīna. wa bi-Muḥammadin (ṣallallāhu `alayhi wa sallama) nabiyya.

Translation

I am pleased with Allah as my Lord, with Islam as my religion, and with Muhammad (peace and blessings of Allah be upon him) as my Prophet.(Recite three times in Arabic.)