Ash-Shu'araa • BN-TAFSEER-IBN-E-KASEER
﴿ وَيَضِيقُ صَدْرِى وَلَا يَنطَلِقُ لِسَانِى فَأَرْسِلْ إِلَىٰ هَٰرُونَ ﴾
“and then my breast will be straitened and my tongue will not be free: send, then, [this Thy command] to Aaron.”
Please check ayah 26:22 for complete tafsir.