Jace Wayland (to Alec): Entreat me not to leave thee, or to return from following after thee. For whither thou goest, I will go. And where thou lodgest… Thy people will be my people, thy God will be my God. When thou diest, I will die. And there will I be buried. The Angel do so to me, and more also. If aught but death part thee and me.

(Parabatai oath)

From Shadowhunters – Season 2 Episode 3: ‘Parabatai Lost’ (2×03)