Parashas Vayikra · Aliyah 1 · Passuk 2
Chabad.org — English translation + Rashi
Torah Temima points to Toras Kohanim (Sifra) on ki yakriv (verified; voluntary vs. mandatory).
Sefaria — Sifra / Toras Kohanim
English: “If he offers” — I might think it is obligatory; therefore the Torah says “if he offers,” teaching that it is only optional (voluntary).
Custom (force of conditional language) — the word ki / “if” establishes that this chapter’s olah is a voluntary offering, not a mandatory one.
The offerings described in this section are brought by choice, not by obligation. The conditional wording prevents reading the passage as a blanket requirement.