بُلُوغُ الْمَرَامِ
Bulugh al-Maram 208
The Book of Prayer
وَعَنْ جَابِرٍ - رضى الله عنه - أَنَّ اَلنَّبِيَّ - صلى الله عليه وسلم -قَالَ لَهُ : { إِنْ كَانَ اَلثَّوْبُ وَاسِعًا فَالْتَحِفْ بِهِ" } - يَعْنِي : فِي اَلصَّلَاةِ - وَلِمُسْلِمٍ : { "فَخَالِفْ بَيْنَ طَرَفَيْهِ - وَإِنْ كَانَ ضَيِّقًا فَاتَّزِرْ بِهِ " } . مُتَّفَقٌ عَلَيْهِ . [1]
Narrated Jabir (RA): The Prophet (ﷺ) said: "If the garment is ample, wrap it round your body i.e. during the Salat (prayer)." A narration by Muslim has: "you should cross the two ends, and if it is tight, you should wrap it round your waist." [Agreed upon].
Sunnah.com reference: Book 2, Hadith 71