Ash-Shu‘arā’ - 13

﴿وَيَضِيقُ صَدْرِي وَلَا يَنْطَلِقُ لِسَانِي فَأَرْسِلْ إِلَىٰ هَارُونَ﴾

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