Ephesians 4:29-30

Do not let any unwholesome talk come out of your mouths, but only what is helpful for building others up according to their needs, that it may benefit those who listen. And do not grieve the Holy Spirit of God, with whom you were sealed for the day of redemption. 

Do not let any unwholesome talk come out of your mouths 
Matthew 12:36-37  "But I tell you that everyone will have to give account on the day of judgment for every empty word they have spoken. For by your words you will be acquitted, and by your words you will be condemned."
Ephesians 5:4  Nor should there be obscenity, foolish talk or coarse joking, which are out of place, but rather thanksgiving.
Colossians 3:8  But now you must also rid yourselves of all such things as these: anger, rage, malice, slander, and filthy language from your lips.

but only what is helpful for building others up 
Romans 14:19  Let us therefore make every effort to do what leads to peace and to mutual edification.

And do not grieve the Holy Spirit of God 
Isaiah 63:10  Yet they rebelled and grieved his Holy Spirit. So he turned and became their enemy and he himself fought against them.
1 Thessalonians 5:19  Do not quench the Spirit.

with whom you were sealed 
2 Corinthians 1:21-22  Now it is God who makes both us and you stand firm in Christ. He anointed us, set his seal of ownership on us, and put his Spirit in our hearts as a deposit, guaranteeing what is to come.
2 Corinthians 5:5  Now the one who has fashioned us for this very purpose is God, who has given us the Spirit as a deposit, guaranteeing what is to come.
Ephesians 1:13-14  And you also were included in Christ when you heard the message of truth, the gospel of your salvation. When you believed, you were marked in him with a seal, the promised Holy Spirit, who is a deposit guaranteeing our inheritance until the redemption of those who are God's possession--to the praise of his glory.

for the day of redemption 
Romans 8:23  Not only so, but we ourselves, who have the firstfruits of the Spirit, groan inwardly as we wait eagerly for our adoption to sonship, the redemption of our bodies.

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984, 2011 by Biblica, Inc.® Used by permission. All rights reserved worldwide. 
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