The noun rida is not in the Quran, but its verb recurs often, in the promise to the believers: “Allah is pleased with them and they are pleased with Him” (98:8; 5:119). The Prophet ﷺ said: “He has tasted the sweetness of faith who is content with Allah as Lord, Islam as religion and Muhammad as messenger” (Muslim 34).
Meaning of the name Rida
Rida is the verbal noun of radiya, “to be content, satisfied with”: it is contentment, and also the approval one grants. For spiritual masters, rida is the serene acceptance of Allah’s decree. The name is Reda or Ridha in the Maghreb, Reza in Iran and Raza in South Asia, Rıza in Turkey.
Their reward with their Lord will be gardens of perpetual residence beneath which rivers flow, wherein they will abide forever, Allāh being pleased with them and they with Him. That is for whoever has feared his Lord.
Allāh will say, "This is the Day when the truthful will benefit from their truthfulness." For them are gardens [in Paradise] beneath which rivers flow, wherein they will abide forever, Allāh being pleased with them, and they with Him. That is the great attainment.