make a mock. The verb is singular, and probably the plural "fools" means "A great fool makes a mock", &c.
sin = guilt. The proper name for the trespass offering. Hebrew. 'asham (App-44.) Illustrations: the antediluvians (Luk_17:26, Luk_17:27; 1Pe_3:20); Abner (2Sa_2:14-17); Haman (Est_3:13-15. Est_29:2); the Jews (Isa_22:13).
the righteous = upright ones.
favour. Those who offer the trespass offering, experience the Divine favour.