Is it OK to eat with sinners according to scripture? Does Paul contradict Jesus regarding eating with sinners?
Mark 2
15 While Jesus was having dinner at Levi’s house, many tax collectors and sinners were eating with him and his disciples, for there were many who followed him.16 When the teachers of the law who were Pharisees saw him eating with the sinners and tax collectors, they asked his disciples: “Why does he eat with tax collectors and sinners?”
1 Corinthians 5
9 I wrote unto you in my epistle to have no company with fornicators; 10 not at all meaning with the fornicators of this world, or with the covetous and extortioners, or with idolaters; for then must ye needs go out of the world: 11 but as it is, I wrote unto you not to keep company, if any man that is named a brother be a fornicator, or covetous, or an idolater, or a reviler, or a drunkard, or an extortioner; with such a one no, not to eat. 12 For what have I to do with judging them that are without? Do not ye judge them that are within? 13 But them that are without God judgeth. Put away the wicked man from among yourselves.
Paul did not contradict the Lord Jesus Christ with respect to "eating" The scenarios are different from each other.
With regards to the Lord Jesus Christ (in reference to Mark 5), he also said this:
Matthew 9:13 New International Version (NIV)
But go and learn what this means: ‘I desire mercy, not sacrifice.’
For I have not come to call the righteous, but sinners.”
With regards to Apostle Paul (1 Cor 5) it is a different kind of eating:
1 Corinthians 5:6-11 Good News Translation (GNT)
It is not right for you to be proud! You know the saying, “A little bit of yeast makes the whole batch of dough rise.” You must remove the old yeast of sin so that you will be entirely pure. Then you will be like a new batch of dough without any yeast, as indeed I know you actually are. For our Passover Festival is ready, now that Christ, our Passover lamb, has been sacrificed.
Let us celebrate our Passover, then, not with bread having the old yeast of sin and wickedness, but with the bread that has no yeast, the bread of purity and truth.
In the letter that I wrote you I told you not to associate with immoral people. Now I did not mean pagans who are immoral or greedy or are thieves, or who worship idols. To avoid them you would have to get out of the world completely. What I meant was that you should not associate with a person who calls himself a believer but is immoral or greedy or
worships idols or is a slanderer or a drunkard or a thief.
Don't even sit down to eat with such a person.
What is the difference? Paul's eating is about the commemoration of the Lord's Supper not some ordinary meal (like the one Jesus had dinner at Levi’s house).
1 Corinthians 10:14-20 New International Version (NIV)
Therefore, my dear friends, flee from idolatry. I speak to sensible people; judge for yourselves what I say. Is not
the cup of thanksgiving for which we give thanks a participation in the blood of Christ? And is not the bread that we break a participation in the body of Christ? Because there is one loaf, we, who are many, are one body, for
we all share the one loaf.
Consider the people of Israel: Do not those who eat the sacrifices participate in the altar? Do I mean then that food sacrificed to an idol is anything, or that an idol is anything? No, but
the sacrifices of pagans are offered to demons, not to God, and
I do not want you to be participants with demons.
Apostle Paul addressed that people who are very sinful should not eat the Lord's Supper otherwise they will only bring swift Judgment on themselves.
1 Corinthians 11:29-31 New International Version (NIV)
For those
who eat and drink without discerning the body of Christ eat and drink judgment on themselves. That is why many among
you are weak and sick, and a number of you have fallen asleep. But if we were more discerning with regard to ourselves, we would not come under such judgment.
This is not a simple dinner, this one is much much more sacred - the Holy Supper of the Lord Jesus Christ being done by the Church of Christ in the first century and in the last days.