until when they arrive at the site of the Reckoning He exalted be He shall say to them ‘Did you deny My prophets by denying My signs without comprehending them from the perspective of your denial in knowledge or what ammā the interrogative mā has been assimilated with am ‘or’ was it dhā is a relative pronoun in other words it is in fact mā alladhī that you did? with the commands given to you.