Hadith: Whoever says: Radītu billāhi rabban, wa bil-Islāmi dīnan, wa bi Muhammadin rasūla (I am pleased with Allah as a Lord, with Islam as a religion, with Muhammad as a Messenger), Paradise is guaranteed for him

عَن أَبي سَعِيدٍ الْخُدْرِيِّ رَضِيَ اللَّهُ عَنْهُ أَنَّ رَسُولَ اللَّهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ قَالَ:
«مَنْ قَالَ: رَضِيتُ بِاللَّهِ رَبًّا، وَبِالْإِسْلَامِ دِينًا، وَبِمُحَمَّدٍ رَسُولًا، وَجَبَتْ لَهُ الْجَنَّةُ».
[صحيح] - [رواه أبو داود] - [سنن أبي داود: 1529]

Abu Sa‘īd al-Khudri (may Allah be pleased with him) reported that the Messenger of Allah (may Allah's peace and blessings be upon him) said:
"Whoever says: Radītu billāhi rabban, wa bil-Islāmi dīnan, wa bi Muhammadin rasūla (I am pleased with Allah as a Lord, with Islam as a religion, with Muhammad as a Messenger), Paradise is guaranteed for him."
[Authentic hadith] - [Narrated by Abu Daoud] - [Sunan Abu Daoud - 1529]

Explanation

The Prophet (may Allah's peace and blessings be upon him) informed that whoever says: (I am pleased with Allah as a Lord), God, Sustainer, Owner, Master, and Reformer; (with Islam) with all of its rulings, the commands and prohibitions, (as a religion), faith, and law by way of belief and submission; (and with Muhammad as a Messenger) and Prophet, with everything he was sent with and conveyed to us—except that Paradise will be guaranteed for him.