There are a number of passages...
There are a number of passages where Jesus is praying and his disciples can see him at prayer. Just as John's disciples asked to be taught how to pray, now Jesus' disciples want a lesson. The prayer he gives them is the one used in every church and every service since that time! We study it in our catechism. It is the center of most of our prayer life, as it covers so much of our needs! To some it may seem curious that we should be taught to pray. Don't we just start talking to God and give him our shopping list? Jesus' prayer covers more ground than just a list of things we want.