Mujahid said that the meaning of «لا تقدموا‏» is that you should not speak ahead of the Prophet Muhammad (peace be upon him). (Rather, listen to «قال الله وقال الرسول» with respect) until Allah conveys the command He wishes to give through His Messenger. The meaning of «امتحن‏» is clarified, examined. The meaning of «لا تنابزوا‏ بالالقاب» is that after becoming a Muslim, do not call him a disbeliever, Jew, or Christian. «لا يلتكم‏» will not decrease your reward at all. In Surah At-Tur, «وما ألتنا» means that We did not decrease the reward of their deeds at all.