Deuteronomy 22:10-11

22:10 You must not plow with an ox and a donkey harnessed together. 22:11 You must not wear clothing made with wool and linen meshed together. ¹ 

Deuteronomy 25:4

25:4 You must not muzzle your ²  ox when it is treading grain.

[22:11]  ¹ tn The Hebrew term שַׁעַטְנֵז (sha’atnez) occurs only here and in Lev 19:19. HALOT 1610-11 s.v. takes it to be a contraction of words (שַׁשׁ [shash, “headdress”] + עַטְנַז [’atnaz, “strong”]). BDB 1043 s.v. שַׁעַטְנֵז offers the translation “mixed stuff” (cf. NEB “woven with two kinds of yarn”; NAB, NIV, NRSV, NLT “woven together”). The general meaning is clear even if the etymology is not.

[25:4]  ¹ tn Heb “an.” By implication this is one’s own animal.