Had they really wanted to mobilize, they would have prepared for it thoroughly. But God disliked their participation, so He discouraged them; they were told, “Stay behind with those who are staying behind.”
وَلَو أَرادُوا الخُروجَ لَأَعَدّوا لَهُ عُدَّةً وَلٰكِن كَرِهَ اللَّهُ انبِعاثَهُم فَثَبَّطَهُم وَقيلَ اقعُدوا مَعَ القٰعِدينَ
wa law araadul khurooja la-‘addoo lahoo ‘uddatanw wa laakin karihal laahum bi’aasahum fasabbatahum wa qeelaq ‘udoo ma’al qaa’ideen