Mt 10:6, Mt 4:23, Mt 9:35, Mt 12:9, Mk 1:21,39, Mk 6:2, Lk 4:15-21,44, Mt 28:19-20
Jesus said that there are many people who will be saved, but to save them, we need harvest workers, that is, disciples. (Mt 9:36-38)
Mt 9:36 But when he saw the multitudes, he was moved with compassion on them, because they fainted, and were scattered abroad, as sheep having no shepherd. 37 Then saith he unto his disciples, The harvest truly is plenteous, but the labourers are few; 38 Pray ye therefore the Lord of the harvest, that he will send forth labourers into his harvest.
Jesus first went to the people of Israel who knew the Old Testament to find disciples. (Mt 10:6)
Mt 10:6 But go rather to the lost sheep of the house of Israel.
Jesus went to the synagogue. As Jesus opened the Old Testament to those who attended the synagogue, He revealed little by little that He was the Christ prophesied in the Old Testament. (Mt 4:23, Mt 9:35, Mt 12:9, Mk 1:21,39, Mk 6:2, Lk 4:15-21,44)
Mt 4:23 And Jesus went about all Galilee, teaching in their synagogues, and preaching the gospel of the kingdom, and healing all manner of sickness and all manner of disease among the people.
Mt 9:35 And Jesus went about all the cities and villages, teaching in their synagogues, and preaching the gospel of the kingdom, and healing every sickness and every disease among the people.
Mt 12:9 And when he was departed thence, he went into their synagogue:
Mk 1:21 And they went into Capernaum; and straightway on the sabbath day he entered into the synagogue, and taught. 39 And he preached in their synagogues throughout all Galilee, and cast out devils.
Mk 6:2 And when the sabbath day was come, he began to teach in the synagogue: and many hearing him were astonished, saying, From whence hath this man these things? and what wisdom is this which is given unto him, that even such mighty works are wrought by his hands?
Lk 4:15 And he taught in their synagogues, being glorified of all. 16 And he came to Nazareth, where he had been brought up: and, as his custom was, he went into the synagogue on the sabbath day, and stood up for to read. 17 And there was delivered unto him the book of the prophet Esaias. And when he had opened the book, he found the place where it was written, 18 The Spirit of the Lord is upon me, because he hath anointed me to preach the gospel to the poor; he hath sent me to heal the brokenhearted, to preach deliverance to the captives, and recovering of sight to the blind, to set at liberty them that are bruised, 19 To preach the acceptable year of the Lord. 20 And he closed the book, and he gave it again to the minister, and sat down. And the eyes of all them that were in the synagogue were fastened on him. 21 And he began to say unto them, This day is this scripture fulfilled in your ears. 44 And he preached in the synagogues of Galilee.
And Jesus sent the found disciples to preach the gospel to all regions. (Mt 28:19-20)
Mt 28:19 Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: 20 Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you always, even unto the end of the world. Amen.