وَإِذَا أَرَادُوا لَفَّ اللِّفَافَةِ عَلَيْهِ: ابْتَدَؤُوا بِالْجَانِبِ الْأَيْسَرِ، فَأَلْقَوْهُ عَلَيْهِ، ثُمَّ بِالْأَيْمَنِ
Translation: When wrapping the outer sheet, fold its left side over the deceased first and then its right side.
The lifafah is the outer wrap and is folded after the underlying pieces are positioned.
The text specifies that its left side is laid over the deceased before its right side, so the body is enclosed.