Evidently, he was afraid that Pharaoh would not receive or pay attention to a representative of Jehovah God.
كَمَا خَشِيَ أَلَّا يُصَدِّقَ شَعْبُهُ أَنَّ يَهْوَهَ عَيَّنَهُ لِيُخْرِجَهُمْ مِنْ مِصْرَ .‏