从一而终
cóng​yī'ér​zhōng

faithful unto death

  1. 从 從 cóng verb
    to comply with
    To obey; to follow a principle, rule, or custom; to listen to
  2. 一 yī numeral
    one
    one; the number 1; single; alone
  3. 而 ér preposition
    to
    Indicates a transition or progression from one state or place to another; to; through to.
  4. 终 終 zhōng adverbadjective
    end
    (bound form) end; finish; the final stage or conclusion of something, opposite of 始 shǐ