Most scholars believe Mark is the earliest biography of Jesus. (Paul's writings and perhaps one or two other New Testament letters are earlier, but they include very little biographical material ...
Shortly after Jesus' interaction with the rich young man: Peter began to say to him, “See, we have left everything and followed you.” Jesus said, “Truly, I say to you, there is no one who has left ...
Here's a story Jesus told about David according to Mark 2:23-28 (ESV): One Sabbath he was going through the grainfields, and as they made their way, his disciples began to pluck heads of grain. ...