Not graded
Sahih Muslim intro-46
وَحَدَّثَنِي حَجَّاجُ بْنُ الشَّاعِرِ، حَدَّثَنَا أَحْمَدُ، - يَعْنِي ابْنَ يُونُسَ - حَدَّثَنَا زَائِدَةُ، عَنِ الأَعْمَشِ، عَنْ إِبْرَاهِيمَ، أَنَّ الْحَارِثَ، قَالَ تَعَلَّمْتُ الْقُرْآنَ فِي ثَلاَثِ سِنِينَ وَالْوَحْىَ فِي سَنَتَيْنِ - أَوْ قَالَ الْوَحْىَ فِي ثَلاَثِ سِنِينَ وَالْقُرْآنَ فِي سَنَتَيْنِ .
Hajjāj bin ash-Shā’ir narrated to me, Ahmad- meaning Ibn Yūnus- narrated to us, Zā’idah narrated to us, on authority of al-A’mash, on authority of Ibrāhīm that al-Hārith said:
‘I studied the Qur’ān for three years and the revelation for two years’; or he said: ‘…the revelation in three years and the Qur’ān in two years ’.
Reported by Muslim (No. intro-46).