These verses give examples of times thieves, robbers, false shepherds, and lack of shepherds caused harm to the flock. Jesus is the true Shepherd.
John 10:1-3
“Most assuredly, I say to you, he who does not enter the sheepfold by the door, but climbs up some other way, the same is a thief and a robber. 2 But he who enters by the door is the shepherd of the sheep. 3 To him the doorkeeper opens, and the sheep hear his voice; and he calls his own sheep by name and leads them out.
Matthew 9:36
But when He saw the multitudes, He was moved with compassion for them, because they were weary and scattered, like sheep having no shepherd.
Mark 6:34
And Jesus, when He came out, saw a great multitude and was moved with compassion for them, because they were like sheep not having a shepherd. So He began to teach them many things.
For the Lamb who is in the midst of the throne will shepherd them and lead them to living fountains of waters. And God will wipe away every tear from their eyes.”
Jesus is the True Shepherd.