Yall christians do not believe in the Quran. Therefore, if muslims uses the holy book of Islam, the Quran, yall christians would not believe in any of its single verses and meanings.
Thus to create a more convincing understanding of the verse and teh meanings, the Bible verses is used. As you can see, most of Quran meanings are similar to the Bible.
When ppl said the bible is corrupted, they are referring to the modern bible, not the ancient bible. IN 1950s, 50 000 contradictions had been discovered in the modern bible by Scientists at the States. Therefore we say that bible is corrupted. But in ancient bible, we agree that bible at that time is of the truth.
What's the use of posting Quran's verses when yall non-believers dun believe it. So as i say again, the bible is use to convince yall.