Deuteronomy 13:8

8 thou shalt not consent to him, neither shalt thou hearken to him; and thine eye shall not spare him, thou shalt feel no regret for him, neither shalt thou at all protect him:

Deuteronomy 13:8 Meaning and Commentary

Deuteronomy 13:8

Thou shall not consent unto him
To commit the idolatry enticed unto, or join with him in it:

nor hearken to him;
not so much as patiently to hear him, but at once express an abhorrence of and indignation at what he recommends:

neither shall thine eye pity him;
pitied he might be for his ignorance, stupidity, and wickedness, and on account of the miserable estate and condition he was in, and of those dreadful consequences which would follow upon it, if not converted from it; but no mercy was to be shown him on account of nearness of relation:

neither shall thou spare;
to reprove him sharply and to expose him to public vengeance:

neither shall thou conceal him;
neither him nor his sin, but make both public, acquaint others with it, and endeavour to bring him before the civil magistrate to be examined, tried, and judged; so far should they be from hiding his offence from others, or excusing and extenuating it, or from harbouring his person privately when sought for upon information.

Deuteronomy 13:8 In-Context

6 And if thy brother by thy father or mother, or thy son, or daughter, or thy wife in thy bosom, or friend who is equal to thine own soul, entreat thee secretly, saying, Let us go and serve other gods, which neither thou nor thy fathers have known,
7 of the gods of the nations that are round about you, who are near thee or at a distance from thee, from one end of the earth to the other;
8 thou shalt not consent to him, neither shalt thou hearken to him; and thine eye shall not spare him, thou shalt feel no regret for him, neither shalt thou at all protect him:
9 thou shalt surely report concerning him, and thy hands shall be upon him among the first to slay him, and the hands of all the people at the last.
10 And they shall stone him with stones, and he shall die, because he sought to draw thee away from the Lord thy God who brought thee out of the land of Egypt, out of the house of bondage.

The Brenton translation of the Septuagint is in the public domain.