whenever a surah is revealed believe in god and fight along with his prophet the welltodo among them ask for leave to stay at home and say leave us with those who are left behind.
وإذا أنزلت سورة أن آمنوا بالله وجاهدوا مع رسوله استأذنك أولو الطول منهم وقالوا ذرنا نكن مع القاعدين