It’s me,” he said, and cleared his throat. “I could understand if you didn’t believe me, but I swear on the Angel, Iz, it’s me.” Alec said nothing, but his grip on Jace’s hand tightened. “You don’t need to swear,” he said, and with his free hand touched the parabatai rune near his collarbone. “I know. I can feel it. I don’t feel like I’m missing a part of me anymore.” “I felt it too.” Jace took a ragged breath. “Something missing. I felt it, even with Sebastian, but I didn’t know what it was I was missing. But it was you. My parabatai.
Cassandra Clare (2012). “Cassandra Clare: The Mortal Instruments Series (5 books): City of Bones; City of Ashes; City of Glass; City of Fallen Angels, City of Lost Souls”, p.2251, Simon and Schuster