Surah Al-Qasas, Verse 34

وَأَخِي هَٰرُونُ هُوَ أَفۡصَحُ مِنِّي لِسَانٗا فَأَرۡسِلۡهُ مَعِيَ رِدۡءٗا يُصَدِّقُنِيٓۖ إِنِّيٓ أَخَافُ أَن يُكَذِّبُونِ٣٤

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."