Mishkat al-Masabih 2 Knowledge كتاب العلم 53

وَعَن ابْن عَبَّاس قَالَ: تَدَارُسُ الْعِلْمِ سَاعَةً مِنَ اللَّيْلِ خَيْرٌ من إحيائها. رَوَاهُ الدَّارمِيّ

Ibn ‘Abbas said, “Studying together for an hour during the night is better than spending the whole night in devotions.” Darimi transmitted it.