'Promised' in the Bible

Now the birth of Jesus Christ was as follows: when His mother Mary had been betrothed to Joseph, before they came together she was found to be with child by [the power of] the Holy Spirit.

And Joseph her [promised] husband, being a just and righteous man and not wanting to expose her publicly to shame, planned to send her away and divorce her quietly.

Whereupon he promised with an oath to give her whatsoever she would ask.