Final answer:
In the Biblical tradition, God's promise to Abraham to bless all nations comes to fruition through Boaz and Ruth, whose marriage plays a crucial role in the ancestry of King David and Jesus, marking the fulfillment of the Covenant with Abraham.
Step-by-step explanation:
The promise made by God to Abraham is a significant event in religious history, which finds its narrative in the Hebrew Bible and the Christian Old Testament. According to the Biblical narrative, God's promise to Abraham that He would bless all nations begins to come to fruition through Boaz and Ruth. Boaz, a wealthy landowner of Bethlehem, marries Ruth, who is a Moabite and the widow of Boaz's relative. Their union is key to the covenant made with Abraham as it leads to the lineage from which King David, and ultimately Jesus, according to Christian belief, would descend, symbolizing the blessing to all nations prophesied in the covenant.
In the Biblical context, Ruth's loyalty and commitment to her mother-in-law Naomi, and her eventual marriage to Boaz, are seen as part of God's providential plan. This lineage is an essential element in the fulfillment of the Covenant with Abraham, emphasizing the theme of faithfulness and God's hand in guiding the course of history to fulfill His promises.