Deuteronomy 25:4

The command not to put a muzzle upon the ox when threshing, is no doubt proverbial in its nature, and even in the context before us is not intended to apply merely literally to an ox employed in threshing, but to be understood in the general sense in which the Apostle Paul uses it in Co1 9:9 and Ti1 5:18, viz., that a labourer was not to be deprived of his wages. As the mode of threshing presupposed here - namely, with oxen yoked together, and driven to and fro over the corn that had been strewn upon the floor, that they might kick out the grains with their hoofs - has been retained to the present day in the East, so has also the custom of leaving the animals employed in threshing without a muzzle (vid., Hoest, Marokos, p. 129; Wellst. Arabien, i. p. 194; Robinson, Pal. ii. pp. 206-7, iii. p. 6), although the Mosaic injunctions are not so strictly observed by the Christians as by the Mohammedans (Robinson, ii. p. 207).

Here is, I. A law to moderate the scourging of malefactors (Deu 25:1-3). II. A law in favour of the ox the treads out the corn (Deu 25:4). III. For the disgracing of him that refused to marry his brother's widow (Deu 25:5-10). IV. For the punishment of an immodest woman (Deu 25:11, Deu 25:12). V. For just weights and measures (Deu 25:13-16). VI. For the destroying of Amalek (Deu 25:17, etc.).

25:4 You must not muzzle an ox: The animal had to be able to eat the grain as it worked (cp. 1 Cor 9:9-14; 1 Tim 5:17-18).