'The Prophet' is a messianic title referring to Jesus of Nazareth, based on Moses' promise in Deuteronomy 18:15-18 that God would raise up a prophet like him. In the New Testament, Jesus is repeatedly identified as this promised prophet, and the people recognized him as a mighty prophet in word and deed. Jesus fulfilled the role of the ultimate prophet by revealing God's will and speaking God's words with perfect authority.
Moses promised the people of Israel that the Lord their God would raise up a prophet like him from among their own brothers, and that they should listen to him.
16For this is what you asked of the LORD your God at Horeb, on the day of the assembly, when you said, "Let me not hear the voice of the LORD my God again or see this great fire anymore, or I will die."
18I will raise up for them a prophet like you from among their brothers. I will put my words in his mouth, and he will tell them everything I command him.
In his speech at Solomon's Colonnade, Peter proclaimed that Jesus is the Prophet Moses had foretold and urged the people to listen to him in all things.
25You are the sons of the prophets and of the covenant God made with your fathers when he said to Abraham, 'And in your offspring all the families of the earth will be blessed.'
In his defense before the Council, Stephen quoted Moses' promise concerning the Prophet and accused the ancestors of the people of rejecting the prophets God had sent, including the Righteous One.
38He is the one who was in the assembly in the wilderness with the angel who spoke to him on Mount Sinai, and with our fathers; and he received living words to pass on to us.
52Which of the prophets did your fathers not persecute? They killed those who foretold the coming of the Righteous One, and now you have betrayed and murdered him—
On the road to Emmaus, the two disciples described Jesus from Nazareth as a prophet, mighty in deed and word before God and all the people, before the risen Jesus revealed himself to them.