ISB ~ Ephesians 4 v30

grieve the Holy Spirit:A warning to avoid sin and the occasions that lead to it. Paul is thinking primarily of destructive speech that disrupts unity and fellowship in the body of Christ (4:29, 31). Theologically, this comment confirms the “Personhood” of the Spirit, since only a person can be saddened or insulted by the faults of another.

• Paul is alluding to Is 63:10, where the Prophet recalls how the Exodus generation of Israel grieved the Spirit by grumbling against the Lord and Moses in the wilderness.

day of redemption:i.e., the day when our bodies will be redeemed at the general resurrection (Rom 8:23).