Now faith is the assurance of things hoped for, the conviction of things not seen. Indeed, by faith our ancestors received approval. By faith we understand that the worlds were prepared by the word of God, so that what is seen was made from things that are not visible.
By faith Noah, warned by God about events as yet unseen, respected the warning and built an ark to save his household; by this he condemned the world and became an heir to the righteousness that is in accordance with faith.
By faith Abraham obeyed when he was called to set out for a place that he was to receive as an inheritance; and he set out, not knowing where he was going.
By faith Abraham, when put to the test, offered up Isaac. He who had received the promises was ready to offer up his only son, of whom he had been told, “It is through Isaac that descendants shall be named for you.” He considered the fact that God is able even to raise someone from the dead—and figuratively speaking, he did receive him back.
Hebrews 11:1,7,8,17-19
By faith, when the angel Gabriel was sent by God to tell Mary, "you will conceive in your womb and bear a son, and you will name him Jesus. He will be great, and will be called the Son of the Most High, and the Lord God will give to him the throne of his ancestor David. He will reign over the house of Jacob forever, and of his kingdom there will be no end." Mary said to the angel, “How can this be, since I am a virgin? The angel said to her, “The Holy Spirit will come upon you, and the power of the Most High will overshadow you; therefore the child to be born will be holy; he will be called Son of God. Then Mary said, “Here am I, the servant of the Lord; let it be with me according to your word.”
Luke 1:32-35, 38