1: ἐντολή
(Strong's #1785 — Noun Feminine — entole — en-tol-ay' )

"a commandment," is translated "precept" in Mark 10:5 (RV, "commandment"); so Hebrews 9:19 . See COMMANDMENT , No. 2.

2: ἔνταλμα
(Strong's #1778 — Noun Neuter — entalma — en'-tal-mah )

is always translated "precepts" in the RV; see COMMANDMENT , No. 3.