Bethsaida was a town to the east of the Sea of Galilee where Golan Heights now resides.
It was mentioned during the ministry of Jesus Christ (ony in the New Testament).
After the baptism of Jesus, he started recruiting disciples to begin his ministry. 3 of the 12 disciples were from Bethsaida - John 1:43-44:
43. The next day Jesus decided to leave for Galilee. Finding Philip, he said to him, "Follow me."
44. Philip, like Andrew and Peter, was from the town of Bethsaida.
Because of its proximity to the Sea of Galilee, a fitting miracle of Jesus was the feeding of over five thousand with 5 loaves of bread and 2 fish at Bethsaida -
Luke 9:10-17:
10. When the apostles returned, they reported to Jesus what they had done. Then he took them with him and they withdrew by themselves to a town called Bethsaida,
11. but the crowds learned about it and followed him. He welcomed them and spoke to them about the kingdom of God, and healed those who needed healing.
12. Late in the afternoon the Twelve came to him and said, "Send the crowd away so they can go to the surrounding villages and countryside and find food and lodging, because we are in a remote place here."
13. He replied, "You give them something to eat." They answered, "We have only five loaves of bread and two fish--unless we go and buy food for all this crowd."
14. (About five thousand men were there.) But he said to his disciples, "Have them sit down in groups of about fifty each."
15. The disciples did so, and everybody sat down.
16. Taking the five loaves and the two fish and looking up to heaven, he gave thanks and broke them. Then he gave them to the disciples to set before the people.
17. They all ate and were satisfied, and the disciples picked up twelve basketfuls of broken pieces that were left over.
After this, Jesus sought solitude to commune with God in Mark 6:45-46:
45. Immediately Jesus made his disciples get into the boat and go on ahead of him to Bethsaida, while he dismissed the crowd.
46. After leaving them, he went up on a mountainside to pray.
Mark 8:22-26:
22. They came to Bethsaida, and some people brought a blind man and begged Jesus to touch him.
23. He took the blind man by the hand and led him outside the village. When he had spit on the man's eyes and put his hands on him, Jesus asked, "Do you see anything?"
24. He looked up and said, "I see people; they look like trees walking around."
25. Once more Jesus put his hands on the man's eyes. Then his eyes were opened, his sight was restored, and he saw everything clearly.
26. Jesus sent him home, saying, "Don't go into the village. "
Even after the examples of Sodom and Gomorrah, humanity still kept making the same mistake - Matthew 11:20-21:
20. Then Jesus began to denounce the cities in which most of his miracles had been performed, because they did not repent.
21. "Woe to you, Korazin! Woe to you, Bethsaida! If the miracles that were performed in you had been performed in Tyre and Sidon, they would have repented long ago in sackcloth and ashes.
Jesus sent out seventy-two, warning them they would sometimes face rejection - Luke 10:1,8-17:
1. After this the Lord appointed seventy-two others and sent them two by two ahead of him to every town and place where he was about to go.
...
8. "When you enter a town and are welcomed, eat what is set before you.
9. Heal the sick who are there and tell them, `The kingdom of God is near you.'
10. But when you enter a town and are not welcomed, go into its streets and say,
11. `Even the dust of your town that sticks to our feet we wipe off against you. Yet be sure of this: The kingdom of God is near.'
12. I tell you, it will be more bearable on that day for Sodom than for that town.
13. "Woe to you, Korazin! Woe to you, Bethsaida! For if the miracles that were performed in you had been performed in Tyre and Sidon, they would have repented long ago, sitting in sackcloth and ashes.
14. But it will be more bearable for Tyre and Sidon at the judgment than for you.
15. And you, Capernaum, will you be lifted up to the skies? No, you will go down to the depths.
16. "He who listens to you listens to me; he who rejects you rejects me; but he who rejects me rejects him who sent me."
17. The seventy-two returned with joy and said, "Lord, even the demons submit to us in your name."
Before the Passover, many sought Jesus - John 12:17-22:
17. Now the crowd that was with him when he called Lazarus from the tomb and raised him from the dead continued to spread the word.
18. Many people, because they had heard that he had given this miraculous sign, went out to meet him.
19. So the Pharisees said to one another, "See, this is getting us nowhere. Look how the whole world has gone after him!"
20. Now there were some Greeks among those who went up to worship at the Feast.
21. They came to Philip, who was from Bethsaida in Galilee, with a request. "Sir," they said, "we would like to see Jesus."
22. Philip went to tell Andrew; Andrew and Philip in turn told Jesus.
