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
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."
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.
Lessons
Encouraging the recitation of this supplication and highlighting the subsequent reward.
Being pleased with Allah as a Lord entails that one worships none but Allah Almighty.
Being pleased with Muhammad (may Allah's peace and blessings be upon him) as a Prophet and Messenger entails obeying him and complying with his Sunnah.
Being pleased with Islam as a religion indicates being pleased with what Allah has chosen for His slaves.
It is recommended to say this supplication after the Two Testimonies of Faith upon hearing the Adhān (call to prayer), as indicated in other narrations.
It was mentioned in another Hadīth that this supplication is recommended in the morning and evening.
Explanation in Arabic
أخبر النبي صلى الله عليه وسلم أن من قال: (رضيت بالله ربًّا) وإلهًا ومربيًا ومالكًا وسيدًا ومصلحًا، (وبالإسلام) بجميع أحكامه من الأوامر والنواهي (دينًا) وملة وشِرعة اعتقادًا وانقيادًا، (وبمحمد رسولًا) ونبيًّا؛ بجميع ما أرسل به وبلغه إلينا، إلا وجبت له الجنة.
الحث على قول هذا الدعاء، وبيان الثواب المترتب عليه.
الرضى بالله ربًا يتضمن أن لا يَعبد المرءُ غيرَه سبحانه.
الرضى بمحمد صلى الله عليه وسلم نبيًّا ورسولًا يتضمن طاعته عليه الصلاة والسلام والانقياد لسنته.
الرضى بالإسلام دينًا رضًا بما اختاره الله لعباده.
استحباب قول هذا الدعاء عند الشهادتين من سماع الأذان كما في الروايات الأخرى.
وجاء في حديث آخر استحباب هذا الدعاء في الصباح والمساء.
وعن أبي سعيد الخدري رضي الله عنه أن رسول الله صلى الله عليه وسلم قال: "من رضي بالله ربًا وبالإسلام دينًا، وبمحمد رسولا وجبت له الجنة" فعجب لها أبو سعيد فقال أعدها علي يا رسول الله فأعادها عليه ثم قال: "وأخرى…