﴿ 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 do not grieve for them and do not be distressed by their schemes — this is meant to comfort the Prophet s in other words do not be concerned with their plotting against you for We will grant you victory over them.