The first to state his case seems right.

Proverbs 18:17
The first to state his case seems right
until another comes and cross-examines him.
Holman Christian Standard Bible (HCSB)

Yes, we are to listen to others, but we should be discerning while we listen. No one is perfect but God. When anyone else tells you something it is proper to ask questions. Look into it for yourselves.