Al-Qasas 28:34

وَأَخِى هَـٰرُونُ هُوَ أَفْصَحُ مِنِّى لِسَانًا فَأَرْسِلْهُ مَعِىَ رِدْءًا يُصَدِّقُنِىٓ ۖ إِنِّىٓ أَخَافُ أَن يُكَذِّبُونِ

Wa-akhī hārūnu huwa afṣaḥu minnī lisānan fa-arsil'hu maʿiya rid'an yuṣaddiqunī innī akhāfu an yukadhibūni

And my brother Aaron is more fluent than me in tongue, so send him with me as support, verifying me. Indeed, I fear that they will deny me."