5 Jesus answered and said to them: On account of the hardness of your heart, Moses wrote you this precept.
Mark 10:5 Cross References - Murdock
Matthew 19:8
8 He said to them: Moses, on account of the hardness of your heart, permitted you to divorce your wives: but from the beginning it was not so.
Acts 7:51
51 O ye stiff of neck, and uncircumcised in their heart, and in their hearing; ye do always set yourselves against the Holy Spirit; as your fathers, so also ye.
Hebrews 3:7-10
7 Because the Holy Spirit hath said: To-day, if ye will hear his voice,
8 harden not your hearts to anger him, like the provocators, and as in the day of temptation in the wilderness,
9 when your fathers tempted me, and proved, and saw my works forty years.
10 Therefore I was disgusted with that generation, and said: This is a people, whose heart wandereth, and they have not known my ways: