Verses with the word twins in the Old Testament (6 verses):

Genesis 25:24
And when her days to be delivered were fulfilled, behold, there were twins in her womb.

Genesis 38:27
And it came to pass in the time of her travail, that, behold, twins were in her womb.

Canticles 4:2
Thy teeth are like a flock of sheep that are even shorn, which came up from the washing; whereof every one bear twins, and none is barren among them.

Canticles 4:5
Thy two breasts are like two young roes that are twins, which feed among the lilies.

Canticles 6:6
Thy teeth are as a flock of sheep which go up from the washing, whereof every one beareth twins, and there is not one barren among them.

Canticles 7:3
Thy two breasts are like two young roes that are twins.