Exodus 7:13

Yet Pharaoh’s heart became hard, ¹  and he did not listen to them, just as the Lord had predicted.

Ex 4:21; Ex 7:4; Ex 8:15; Ex 10:1,20,27; Ex 14:17; De 2:30; Zec 7:11,12; Ro 1:28; Ro 2:5; Heb 3:7,8,13

¹ tn This phrase translates the Hebrew word חָזַק (khazaq); see S. R. Driver, Exodus, 53.

sn For more on this subject, see B. Jacob, Exodus, 241-49. S. R. Driver (Exodus, 53) notes that when this word (חָזַק) is used it indicates a will or attitude that is unyielding and firm, but when כָּבֵד (kaved) is used, it stresses the will as being slow to move, unimpressionable, slow to be affected.