10.What exhortation had the Hebrew Christians forgotten?

That Christians are not to despise the Lord’s discipline nor are we to faint when He reproves us; for whom the Lord loves He disciplines and chastens severely every son whom He receives.

My son, despise not the chastening of the Lord; neither be weary of his correction: for whom the Lord loveth he correcteth; even as a father the son in whom he delighteth (Proverbs 3:11,12)

As many as I love, I rebuke and chasten: be zealous therefore, and repent (Revelation 3:19).