Luke 6:17

‘And he came down with them, and stood on a level place, and a great multitude of his disciples, and a great number of the people from all Judaea and Jerusalem, and the sea coast of Tyre and Sidon, who came to hear him, and to be healed of their diseases.'

Having chosen the twelve He then came down with all His disciples to a level place, quite probably still on the mountain. There He found a great crowd of disciples, people who came regularly to hear Him, and along with them hosts of people from all around, from Judaea and Jerusalem in the south, to Tyre and Sidon in the north. While there were many Jews in Tyre and Sidon there were also many Gentiles, and it is quite likely that Luke wants us to realise that Gentiles came too, and were welcome. Many had come in order to be healed.