[Then] the Son of man came eating and drinking [at festive occasions] and you said, 'Look, he is a glutton and a drunkard, and a friend of tax collectors and worldly people.'

But let God be truthful, [even if] everyone [else] is a liar. For it is written [Psa. 51:4], "[God], you should be proven right when you speak, and win [your case] when put on trial."

and so that the Gentiles [also] may honor God for His mercy, as it is written [Psa. 18:49], "Therefore, I will praise you among the Gentiles and sing to your name." [Note: Paul here accommodates the words of King David by applying them to Jews participating with Gentiles in praising God as part of the one body].

For

For my son here was dead [spiritually], but is [now] alive again. He was lost [from me], but [now] is found.' And they began to celebrate.

And you [Gentiles] were once [spiritually] dead because of your shortcomings and sins.

General references

For the Son of man came to save those who were lost.]}]}

For the Son of man came to search for and save those who were lost."

So, they gave honor to God for [what He was doing through] me.