Quran:
Believers, do not make friends with any but your own people, They desire nothing but your ruin, You believe in the entire Book, When they meet you they say: 'We, too, are believers.' But when alone, they bite their finger-tips with rage." (Surah 3:118, 119)

Believers, take neither Jews nor Christians for your friends." (Surah 5:51)

Bible:
Do not be yoked together with unbelievers. For what do righteousness and wickedness have in common? Or what fellowship can light have with darkness? 2corinthians 6.14

Frosbel and other learned bible scholars/Christians kindly shed more light on the above.

How come both the bible and the quran said things that looks they both "agree" on the same message:dont be unequally yoked with unbelievers?

@Kx If you read many of the holy books of most religions the teachings are very much the same. This brings one to think that there is not one true religion per se, but various paths to the same place, which is communion with God.