Wormtail was speaking. His voice shook; he seemed…

““Wormtail was speaking. His voice shook; he seemed frightened beyond his wits. He raised his wand, closed his eyes, and spoke to the night. “Bone of the father, unknowingly given, you will renew your son!” The surface of the grave at Harry’s feet cracked. Horrified, Harry watched as a fine trickle of dust rose into the air at Wormtail’s command and fell softly into the cauldron. The diamond surface of the water broke and hissed; it sent sparks in all directions and turned a vivid, poisonous-looking blue. And now Wormtail was whimpering. He pulled a long, thin, shining silver dagger from inside his cloak. His voice broke into petrified sobs. “Flesh — of the servant — w-willingly given — you will — revive — your master.” He stretched his right hand out in front of him — the hand with the missing finger. He gripped the dagger very tightly in his left hand and swung it upward. Harry realized what Wormtail was about to do a second before it happened — he closed his eyes as tightly as he could, but he could not block the scream that pierced the night, that went through Harry as though he had been stabbed with the dagger too. He heard something fall to the ground, heard Wormtail’s anguished panting, then a sickening splash, as something was dropped into the cauldron. Harry couldn’t stand to look . . . but the potion had turned a burning red; the light of it shone through Harry’s closed eyelids. . . . Wormtail was gasping and moaning with agony. Not until Harry felt Wormtail’s anguished breath on his face did he realize that Wormtail was right in front of him. “B-blood of the enemy . . . forcibly taken . . . you will . . . resurrect your foe.” Harry could do nothing to prevent it, he was tied too tightly. . . . Squinting down, struggling hopelessly at the ropes binding him, he saw the shining silver dagger shaking in Wormtail’s remaining hand. He felt its point penetrate the crook of his right arm and blood seeping down the sleeve of his torn robes. Wormtail, still panting with pain, fumbled in his pocket for a glass vial and held it to Harry’s cut, so that a dribble of blood fell into it. He staggered back to the cauldron with Harry’s blood. He poured it inside. The liquid within turned, instantly, a blinding white. Wormtail, his job done, dropped to his knees beside the cauldron, then slumped sideways and lay on the ground, cradling the bleeding stump of his arm, gasping and sobbing.””

— J.K. Rowling