Al-Qasas - 28:34

وَأَخِي هَارُونُ هُوَ أَفْصَحُ مِنِّي لِسَانًا فَأَرْسِلْهُ مَعِيَ رِدْءًا يُصَدِّقُنِي إِنِّي أَخَافُ أَن يُكَذِّبُونِ
[28:34]
And my brother, Haroun, he is more eloquent of tongue than I, therefore send him with me as an aider, verifying me: surely I fear that they would reject me.
"And my brother Aaron - He is more eloquent in speech than I: so send him with me as a helper, to confirm (and strengthen) me: for I fear that they may accuse me of falsehood."
My brother Aaron is more eloquent than me in speech. Therefor send him with me as a helper to confirm me. Lo! I fear that they will give the lie to me.