Hebrews 12:25

12:25 Take care not to refuse the one who is speaking! For if they did not escape when they refused the one who warned them on earth, how much less shall we, if we reject the one who warns from heaven?

Hebrews 12:29

12:29 For our God is indeed a devouring fire. ¹ 

[12:29]  ¹ sn A quotation from Deut 4:24; 9:3.