Muwatta Malik · Hadith 250

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَزِيدَ بْنِ رُومَانَ، أَنَّهُ قَالَ كَانَ النَّاسُ يَقُومُونَ فِي زَمَانِ عُمَرَ بْنِ الْخَطَّابِ فِي رَمَضَانَ بِثَلاَثٍ وَعِشْرِينَ رَكْعَةً ‏.‏

Yahya related to me from Malik that Yazid ibn Ruman said, "The people used to watch the night in prayer during Ramadan for twenty- three rakas in the time of Umar ibn al-Khattab

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).