Concise Quran Commentary
There will only be punishment and blame on those who ask you, O Messenger, for permission to remain behind from striving while they are able to do so, due to their having the means to equip themselves. They are pleased with disgrace and humiliation for themselves by staying behind with those who remain behind at home. Allah has sealed their hearts so they are not affected by any warning. Because of this, they do not know where their best interests lie, so they can choose that; or where there is harm, so they can avoid it.