Matthew 3: Jesus is anointed by the Holy Spirit

 Saul and David were anointed by oil when the Samuel laid his hands on them; thus they were Messiah, "anointed". The point is that the Holy Spirit was with Saul when he was anointed and so with David.
Jesus is our Messiah, but how was he anointed?
We read:

13-14 Jesus then appeared, arriving at the Jordan River from Galilee. He wanted John to baptize him. John objected, “I’m the one who needs to be baptized, not you!”
15 But Jesus insisted. “Do it. God’s work, putting things right all these centuries, is coming together right now in this baptism.” So John did it.
16-17 The moment Jesus came up out of the baptismal waters, the skies opened up and he saw God’s Spirit—it looked like a dove—descending and landing on him. And along with the Spirit, a voice: “This is my Son, chosen and marked by my love, delight of my life.”

It is not written that this was the anointment, but in this passage, the Spirit declared how the Lord loves Jesus, and called Him, his son. Jesus is very precious to the Father and the Father was showing his love on baptism. Jesus was delighted on doing the Father's will.

We, as "little Christ", know that our Father loves us. May we delight on doing his will because we know that his will is good.