One commentator says that leading others into sin can be done in ways that do not involve false teaching. Failure to provide adequate pastoral care, for example, can make us unable to see trouble in the lives of others, leading us to overlook the need to rescue a sheep in danger of going astray. To one degree or another, Jesus has made each believer accountable to every other believer. We honor the Lord who bought us when we care for one another.
For further study:
The Bible in a year: