Jesus was speaking to the church of Laodica also known as the Lukewarm church. They would go about their religious duties but not give their hearts to Jesus.
Dining often is done with people we have relationships with. In this verse Jesus is reaching out to the religious person to hear him and fellowship with him as a friend or brother. In other words he wants a relationship with us.
Luke 15
“Then drew near unto him all the publicans and sinners for to hear him. And the Pharisees and scribes murmured, saying, This man receiveth sinners, and eateth with them. And he spake this parable unto them, saying, What man of you, having an hundred sheep, if he lose one of them, doth not leave the ninety and nine in the wilderness, and go after that which is lost, until he find it? And when he hath found it, he layeth it on his shoulders, rejoicing. And when he cometh home, he calleth together his friends and neighbours, saying unto them, Rejoice with me; for I have found my sheep which was lost. I say unto you, that likewise joy shall be in heaven over one sinner that repenteth, more than over ninety and nine just persons, which need no repentance. Either what woman having ten pieces of silver, if she lose one piece, doth not light a candle, and sweep the house, and seek diligently till she find it? And when she hath found it, she calleth her friends and her neighbours ...