Exodus 4:15 means that when God calls someone to speak, He does not leave them to find their own words. He promises to supply what they need to say and to be present with them as they say it. God speaks these words to Moses, who has just objected that he is not an eloquent man and asked God to send someone else. The promise is God’s answer to Moses’ fear of speaking in front of Pharaoh and the Israelite people.
You shall speak to him, and put the words in his mouth. I will be with your mouth, and with his mouth, and will teach you what you shall do.
Exodus 4:15 (WEB)
What Exodus 4:15 Means
The verse begins with “You shall speak to him, and put the words in his mouth.” God is telling Moses that he will be the one who speaks to his brother Aaron, and that God will supply the content of that speech. Moses is not being asked to invent a message from his own resources. The words come from God, which takes the weight of inspiration off Moses’ shoulders.
The second half says, “I will be with your mouth, and with his mouth, and will teach you what you shall do.” Here God takes responsibility both for Moses’ speech and for Aaron’s. He does not say that Moses will become a gifted orator. He says that He Himself will be involved in the speaking and will instruct Moses in what to do. The promise is about divine presence and guidance, not about personal polish.
What the verse does not promise is that every hard task will feel easy or that Moses will never stumble. Moses still goes on to face Pharaoh, and the story includes frustration and failure along the way. The verse promises that God will be with the speaker and will teach them, which is a promise of help in the task rather than a guarantee that the task will be comfortable.
The Context of Exodus 4:15
Exodus is traditionally attributed to Moses, and it tells how God rescued the descendants of Jacob from slavery in Egypt and formed them into a nation at Mount Sinai. The book was written for the people of Israel, who needed to understand who their God was and why He had acted on their behalf. Chapter 4 falls at the point where God first commissions Moses for this work, at the burning bush.
Just before verse 15, Moses has been given a call that includes a promise that God will be with his mouth and teach him what to say, and Moses has responded with reluctance. In verse 14, God’s anger burns against Moses, and God then offers Aaron as a spokesman. Verse 15 is God’s clarification that Aaron will not be an independent voice, because God Himself will guide both men. Seen this way, the verse is less a comfort for a nervous speaker and more a shaping of the partnership God has chosen to build.
Key Phrases in Exodus 4:15
Jeremiah 1:9
Then the LORD stretched out his hand, and touched my mouth. Then the LORD said to me, “Behold, I have put my words in your mouth.
(WEB)
In this call scene, God touches Jeremiah’s mouth and tells him that He has put His words in it. Like Moses, Jeremiah protests that he is too young to speak, and God answers by promising to supply the message. The parallel shows that God’s pattern of equipping reluctant speakers is a consistent theme in Scripture.
Matthew 10:19
But when they deliver you up, don’t be anxious how or what you will say, for it will be given you in that hour what you will say.
(WEB)
Jesus tells His disciples not to worry about what they will say when they are brought before authorities, because the Holy Spirit will speak through them. The promise echoes Exodus 4:15, showing that God’s commitment to give words to His witnesses continues into the New Testament.
A Short Prayer From Exodus 4:15
Lord, you know how often I feel unready for the things you ask of me. I fear that my words will fall short, that I will stumble or say the wrong thing at the moment it matters most. Thank you that you do not leave me to speak on my own strength. Be with my mouth when I speak, and teach me what to do in each moment. Give me the words I need, and help me trust that you are present in every conversation. Amen.
