1 Kings 17:22-24, 2 Kings 4:32-37, Lk 8:54-55, Jn 11:43-44,
In the Old Testament, prophets performed miracles that saved people. Of course, through these miracles, they showed that they were God's true prophets. (1 Kings 17:22-24, 2 King 4:32-37)
1 Kings 17:22 And the Lord heard the voice of Elijah; and the soul of the child came into him again, and he revived. 23 And Elijah took the child, and brought him down out of the chamber into the house, and delivered him unto his mother: and Elijah said, See, thy son liveth. 24 And the woman said to Elijah, Now by this I know that thou art a man of God, and that the word of the Lord in thy mouth is truth.
2 King 4:32 And when Elisha was come into the house, behold, the child was dead, and laid upon his bed. 33 He went in therefore, and shut the door upon them twain, and prayed unto the Lord. 34 And he went up, and lay upon the child, and put his mouth upon his mouth, and his eyes upon his eyes, and his hands upon his hands: and stretched himself upon the child; and the flesh of the child waxed warm. 35 Then he returned, and walked in the house to and fro; and went up, and stretched himself upon him: and the child sneezed seven times, and the child opened his eyes. 36 And he called Gehazi, and said, Call this Shunammite. So he called her. And when she was come in unto him, he said, Take up thy son. 37 Then she went in, and fell at his feet, and bowed herself to the ground, and took up her son, and went out.
Jesus also performed the miracle of raising the dead. This shows that Jesus is the true prophet of God. (Lk 7:11-16, Lk 8:54-55, Jn 11:43-44)
Lk 7:11 And it came to pass the day after, that he went into a city called Nain; and many of his disciples went with him, and much people. 12 Now when he came nigh to the gate of the city, behold, there was a dead man carried out, the only son of his mother, and she was a widow: and much people of the city was with her. 13 And when the Lord saw her, he had compassion on her, and said unto her, Weep not. 14 And he came and touched the bier: and they that bare him stood still. And he said, Young man, I say unto thee, Arise. 15 And he that was dead sat up, and began to speak. And he delivered him to his mother. 16 And there came a fear on all: and they glorified God, saying, That a great prophet is risen up among us; and, That God hath visited his people.
Lk 8:54 And he put them all out, and took her by the hand, and called, saying, Maid, arise. 55 And her spirit came again, and she arose straightway: and he commanded to give her meat.
Jn 11:43 And when he thus had spoken, he cried with a loud voice, Lazarus, come forth. 44 And he that was dead came forth, bound hand and foot with graveclothes: and his face was bound about with a napkin. Jesus saith unto them, Loose him, and let him go.