Tafsir: Al-Fajr 89:28

رَاضِيَةً مَّرْضِيَّةً (...well-pleased, well-pleasing....89:28). [ The true believer's ] soul is well-pleased with decrees destined by Allah and His legislative commands, and Allah too is well-pleased with His slave. The slave's being pleased with Allah's decrees and injunctions is a sign that Allah is pleased.