"The first duty of ministers is to pray for those to whom they are sent in ministry. I can't think of any one verse which commands this, but it coudl be inferred from Paul's example (e.g. Rom 1:9; Eph 1:16; Phil 1:3-4; Col 1:3-4; 1 Thess 1:2-3; 2: Thess 1:11)." - Motyer, p132.
Of course this should be applied to all in shepherding and ministerial roles and not simply to the ordained pastor. Parents and husbands in particular have to heed this truth as well. But they will probably only rise up to the level of their minister who must lead the charge in believing prayer.