Hebrews 11:15

11:15 In fact, if they had been thinking of the land that they had left, they would have had opportunity to return.

Hebrews 12:20

12:20 For they could not bear what was commanded: “If even an animal touches the mountain, it must be stoned.” ¹ 

[12:20]  ¹ sn A quotation from Exod 19:12-13.