Verses with the word mothers in the Old Testament (4 verses):

Isaiah 49:23
And kings shall be thy nursing fathers, and their queens thy nursing mothers: they shall bow down to thee with their face toward the earth, and lick up the dust of thy feet; and thou shalt know that I am the LORD: for they shall not be ashamed that wait for me.

Jeremiah 16:3
For thus saith the LORD concerning the sons and concerning the daughters that are born in this place, and concerning their mothers that bare them, and concerning their fathers that begat them in this land;

Lamentations 2:12
They say to their mothers, Where is corn and wine? when they swooned as the wounded in the streets of the city, when their soul was poured out into their mothers' bosom.

Lamentations 5:3
We are orphans and fatherless, our mothers are as widows.