Ash Shu’ara’ Ayah 13

وَيَضِيقُ صَدْرِى وَلَا يَنطَلِقُ لِسَانِى فَأَرْسِلْ إِلَىٰ هَـٰرُونَ ١٣ And ?so? my heart will be broken and my tongue will be tied. So send Aaron along ?as a messenger?.