Pray that your husband will choose his friends wisely. Pray that God will bring him men who will encourage his accountability before God, and will not lead him into sin.
Proverbs 13:20 (New International Version)
20 He who walks with the wise grows wise,but a companion of fools suffers harm.
Proverbs 27:17 (New International Version)
17 As iron sharpens iron,so one man sharpens another.