2 Timothy 2:2

Paul encourages Timothy to teach others. More specifically, Timothy is not just to teach them, but to entrust teaching to these men so that they can teach others. These men aren't just to be any men, but they should be faithful men. It is important to pass down teaching to the next generation. If teaching remains and is not passed down, it will not continue when those original people pass away. Teaching should be taught and passed along, ensuring that the men are faithful and will teach it as well. The teaching should also be that which Timothy has heard Paul teaching in the presence of many witnesses. Timothy certainly spent a lot of time with Paul and heard a lot of what Paul said and taught. Specifically, the teachings Timothy is to pass down are the teachings that have been mentioned in the presence of other witnesses. This means that other witnesses are present, so that the teaching has been screened by them. If Paul was teaching heresy, then the other witnesses would have cried foul. However, these would be the tried and tested teachings which are to be passed down. It is important to pass down important teachings, and it is important to ensure that the correct teachings are passed down. If false teachings are passed down, then it will spread and corrupt many people.