Hadith 9:28
‘Umar said, “Learn the rules of inheritance,” Ibn Mas'ud adding, “of divorce and of the pilgrimage,” and both saying, “for it pertains to your religion.” Darimi transmitted it.
وَعَنْ عُمَرَ رَضِيَ اللَّهُ عَنْهُ قَالَ: تَعَلَّمُوا الْفَرَائِضَ وَزَادَ ابْنُ مَسْعُودٍ: وَالطَّلَاقَ وَالْحَجَّ قَالَا: فَإِنَّهُ من دينكُمْ. رَوَاهُ الدَّارمِيّ
Original Reference: Mishkat al-Masabih 3069