﴿ وَلَا تَحْزَنْ عَلَيْهِمْ وَلَا تَكُن فِى ضَيْقٍۢ مِّمَّا يَمْكُرُونَ ﴾

“But do not grieve over them, and neither be distressed by the false arguments which they devise [against Gods messages].”

(And grieve thou not) O Muhammad (for them) if they do not believe; it is also said that this means: do not grieve for their destruction, (nor be in distress because of what they plot (against you)) and do not be grieved because of what they do and say against you.