'Widow's' in the Bible

They drive away the ass of the fatherless, they take the widow's ox for a pledge.

The blessing of him that was ready to perish came upon me: and I caused the widow's heart to sing for joy.

If I have refused the wishes of the pooror let the widow’s eyes go blind,

(But from my youth the orphan grew up with me as with a father,And from my mother’s womb I have been the widow’s guide),