I Peter 3:9

evil--in deed. railing--in word. blessing--your revilers; participle, not a noun after "rendering." knowing that--The oldest manuscripts read merely, "because." are--Greek, "were called." inherit a blessing--not only passive, but also active; receiving spiritual blessing from God by faith, and in your turn blessing others from love [GERHARD in ALFORD]. "It is not in order to inherit a blessing that we must bless, but because our portion is blessing." No railing can injure you (Pe1 3:13). Imitate God who "blesses" you. The first fruits of His blessing for eternity are enjoyed by the righteous even now (Pe1 3:10) [BENGEL].

Wherein the apostle describes the duties of husbands and wives one to another, beginning with the duty of the wife (Pe1 3:1-7). He exhorts Christians to unity, love, compassion, peace, and patience under sufferings; to oppose the slanders of their enemies, not by returning evil for evil, or railing for railing, but by blessing; by a ready account of their faith and hope, and by keeping a good conscience (Pe1 3:8-17). To encourage them to this, he proposes the example of Christ, who suffered, the just for the unjust, but yet punished the old world for their disobedience, and saved the few who were faithful in the days of Noah (Pe1 3:18 to the end).

3:9 and he grant you his blessing: By blessing others, we receive a blessing from God.