Sunan Abu Dawud
1529
Sahih+3

Abu Sa'id al-Khudri reported the Messenger of Allah (ﷺ) as saying:If anyone says "I am pleased with Allah as Lord, with Islam as religion and with Muhammad (ﷺ) as Apostle" Paradise will be his due

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid