God showed Jesus to be the Son of God by God’s Spirit descending upon him; by Himself, God the Father, declaring it; by Satan testing him; and by the angels taking care of him.

Mark 1:9-13

9 During that time when John was preaching, Jesus came from Nazareth town, which is in Galilee district. He went to where John was preaching and he was baptized by John {John baptized him} in the Jordan River. 10 Immediately after Jesus came up out of the water, he saw heaven opened up and he saw the Spirit of God descending on himself. He came in the form of a dove. 11 And God [MTY] spoke to him from heaven saying, “You are my Son, whom I love dearly. I am very pleased with you.” 12 ◄Then/Right away► the Spirit of God sent Jesus into the desolate area. 13 He was there for 40 days. During that time, he was tempted by Satan {Satan tempted him}. There were wild animals there also. But angels took care of him.