Where did Jesus preach the Sermon on the Mount?

Matthew 5:1-3

Now when he saw the crowds, he went up on a mountainside and sat down. His disciples came to him, and he began to teach them, saying, "Blessed are the poor in spirit, for theirs is the kingdom of heaven."

Luke 6:17, 20

He went down with them and stood on a level place...Looking at his disciples, he said: "Blessed are you who are poor, for yours is the kingdom of God."

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