كتاب الصلاة
2  
The Book of Prayer
Bulugh al-Maram 291
at-Tabarani narrated the Hadith of Ibn Mas'ud which has the addition "... he [the Prophet (ﷺ)] did that constantly."
وَلِلطَّبَرَانِيِّ مِنْ حَدِيثِ اِبْنِ مَسْعُودٍ : { يُدِيمُ ذَلِكَ } 1
Reference : Bulugh al-Maram 291
In-book reference : Book 2, Hadith 291
English translation : Book 2, Hadith 289
Hadith Text
Reference