Luke 15:32

But it became us to make merry and rejoice; for this your brother was dead, and is alive again: was lost, and is found.

Luke 15:24

for this my son was dead, and is alive again: he was lost, and is found. And they began to be merry.

Luke 7:34

The Son of man has come, eating and drinking, and you say, Behold, a gluttonous man and a drinker of wine, a friend of publicans and sinners.

Romans 3:4

It can not be. But let God be true, though every man be a liar, as it is written: That thou mightest be justified in thy words, and mightest overcome when thou art judged.

Romans 3:19

Now we know that what the law says, it speaks- to those who are under the law, that every mouth may be stopped, and all the world become guilty before God.

Romans 15:9-13

and that the Gentiles might glorify God for his mercy, as it is written: For this cause I will give praise to thee among the Gentiles, and to thy name will I sing.

Ephesians 2:1-10

Even you, being dead to offenses and sins,

Treasury of Scripture Knowledge

Summary

It was meet that we should make merry, and be glad: for this thy brother was dead, and is alive again; and was lost, and is found.

Bible References

Was meet

Luke 7:34
The Son of man has come, eating and drinking, and you say, Behold, a gluttonous man and a drinker of wine, a friend of publicans and sinners.
Romans 3:4
It can not be. But let God be true, though every man be a liar, as it is written: That thou mightest be justified in thy words, and mightest overcome when thou art judged.
Romans 15:9
and that the Gentiles might glorify God for his mercy, as it is written: For this cause I will give praise to thee among the Gentiles, and to thy name will I sing.

For

Luke 15:24
for this my son was dead, and is alive again: he was lost, and is found. And they began to be merry.
Ephesians 2:1
Even you, being dead to offenses and sins,

General references

Matthew 18:11
For the Son of man has come to save that which is lost.
Luke 19:10
For the Son of man has come to seek and to save that which was lost.
Galatians 1:24
And they glorified God in me.