Ephesians 5:4

or obscenity, or foolish talk, or loose witticisms; things which become not [a Christian], but rather thanksgiving.

Ephesians 4:29

Let no loose discourse proceed out of your mouth, but whatever is good for useful edification, that it may communicate grace to the hearers.

Romans 1:28

And since they thought not fit to hold the Deity in acknowledgment, God abandoned them to a reprobate mind, to practise deeds unbecoming;

Matthew 12:34-37

Ye broods of vipers, how can ye speak good things, yourselves being wicked? for out of the abundance of the heart the mouth speaketh.

Mark 7:22

thefts, inordinate cravings, mischievous actions, knavery, lewdness, an evil eye, blasphemy, pride, folly:

John 6:23

(but now little vessels had come from Tiberias near to the spot where they had eaten bread, after the Lord had given thanks:)

2 Corinthians 1:11

ye also labouring together for us in prayer, that from many persons thanks may be given on our behalf for the gifts bestowed on us by many.

2 Corinthians 9:15

Thanks be to God for his inexpressible gift.

Ephesians 1:16

have not ceased offering up my praises for you, making mention of you in my prayers,

Ephesians 5:19-20

speaking one to another in psalms and hymns, and spiritual canticles, singing and making melody in the heart to the Lord;

Philippians 4:6

Be not anxious about any thing, but in every case by prayer and supplication, with thanksgiving, let your petitions be made known unto God.

Colossians 3:8

but now ye have put away all these things, anger, asperity, malice, scandal, obscenity, out of your mouth.

Colossians 3:15-17

And let the peace of God set up its throne in your hearts, whereunto also ye have been called in one body; and be ye thankful.

1 Thessalonians 3:9

For what sufficient thanks can we render to God for you, for all the joy with which we rejoice on your account before our God,

1 Thessalonians 5:18

In every thing give thanks: for this is the will of God in Christ Jesus to you-wards.

Hebrews 13:15

By him therefore let us offer a sacrifice of praise perpetually to God, that is the fruit of our lips confessing his name.

James 3:4-8

Behold also the ships, though so great, and driven by tempestuous winds, are turned about by the smallest rudder, whithersoever the inclination of the pilot pleaseth.

2 Peter 2:7

but righteous Lot, afflicted grievously with the infamously impure conduct of those lawless men, he plucked out:

2 Peter 2:18

Uttering pompous discourses of inanity, ensnaring by the lusts of the flesh, by lascivious impurities, those who had truly escaped from such as live in a course of delusion.

Jude 1:10

But these men speak evil even of the things of which they have no knowledge: but such things as they know naturally, as the brute beasts, in these they corrupt themselves.

Jude 1:13

raging billows of the sea foaming out their own infamies; stars wandering from their courses, for whom the blackness of darkness for ever is reserved.

Treasury of Scripture Knowledge

Summary

Neither filthiness, nor foolish talking, nor jesting, which are not convenient: but rather giving of thanks.

Bible References

Convenient

Romans 1:28
And since they thought not fit to hold the Deity in acknowledgment, God abandoned them to a reprobate mind, to practise deeds unbecoming;
Philemon 1:8
Wherefore, though I have in Christ great liberty to enjoin thee what is becoming,

But

Ephesians 5:19
speaking one to another in psalms and hymns, and spiritual canticles, singing and making melody in the heart to the Lord;
Ephesians 1:16
have not ceased offering up my praises for you, making mention of you in my prayers,
John 6:23
(but now little vessels had come from Tiberias near to the spot where they had eaten bread, after the Lord had given thanks:)
2 Corinthians 1:11
ye also labouring together for us in prayer, that from many persons thanks may be given on our behalf for the gifts bestowed on us by many.
2 Corinthians 9:15
Thanks be to God for his inexpressible gift.
Philippians 4:6
Be not anxious about any thing, but in every case by prayer and supplication, with thanksgiving, let your petitions be made known unto God.
Colossians 3:15
And let the peace of God set up its throne in your hearts, whereunto also ye have been called in one body; and be ye thankful.
1 Thessalonians 3:9
For what sufficient thanks can we render to God for you, for all the joy with which we rejoice on your account before our God,
1 Thessalonians 5:18
In every thing give thanks: for this is the will of God in Christ Jesus to you-wards.
Hebrews 13:15
By him therefore let us offer a sacrifice of praise perpetually to God, that is the fruit of our lips confessing his name.