[af_vet_1981]

Do his misdeeds somehow abrogate the validity of Zacharias’ sermons and teaching?

• Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves.
• Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles?
• Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit.
• A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit.
• Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.
• Wherefore by their fruits ye shall know them.
• Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
• Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
• And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.

Matthew, Catholic chapter seven, Protestant verses fifteen to twenty three,
as authorized, but not authored, by King James

[SeekAndFind]

I think this is the more relevant passage...

Then Jesus spoke to the multitudes and to his disciples, saying, "The scribes and the Pharisees sat on Moses' seat. Therefore, all things whatsoever they tell you to observe, observe and do, but do not do their works ; for they say, and do not do."

— Matt. 23:1-3