Ash-Shu'araa 26:13

وَيَضِيقُ صَدْرِى وَلَا يَنطَلِقُ لِسَانِى فَأَرْسِلْ إِلَىٰ هَٰرُونَ ١٣

And that my breast will tighten and my tongue will not be fluent, so send for Aaron.