A man recited for the Commander of the Faithful عليه السلام - ‘Fa Innahum La Yukadhdhibunaka wa Lakinna l-Dhalimina bi Ayati-llahi Yajhadun’ so he (i.e. the Imam) said: Indeed by Allah - they rejected him (i.e. the prophet) a most severe rejection, but it (the word in the verse) is softened (i.e. pronounced without Shadda) ‘La Yukdhibunaka’, (that is) they will not come with a falsehood by which to negate your truth (i.e. render it false)