'You shall not respect persons in judgment; but you shall hear the small as well as the great; you shall not be afraid of the face of man; for the judgment is God’s ' Deut 1:17
'These things also belong to the wise. It is not good to have respect of persons in judgment. ' Prov 24:23
When the believer knows the Word and avoids in telling some one the truth because of fear, the Lord does not take this lightly. If the Lord moves you to rebuke or warn a believer, it must be done. In Revelation 21:8 tells us;
'But the FEARFUl, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burne with fire and brimstone: which is the second death. '
If you see your neighbors house burning, I do not believe I would just stand and say, 'O well, I do not want to bother them, or it is not my business' and avoid at all cost; that is the same way with a sinner when individuals will avoid due to fear or 'he/she is going to curse me out or they will get angry'..etc. No excuse, especially if the individual is an elder in the ways of the Lord, they should know better. Not all individuals are given this gift in ministering this way. Some will just pray for them if they feel unsure. But to avoid just because of fear is very dangerous. That is why the Lord tells you in Scripture, Count the Cost when you come to follow Jesus.