The word(s) "basis" appears 2 time(s) in 2 verse(s) in Quran in Muhammad Habib Shakir translation.

(1) He it is Who has revealed the Book to you; some of its verses are decisive, they are the basis of the Book, and others are allegorical; then as for those in whose hearts there is perversity they follow the part of it which is allegorical, seeking to mislead and seeking to give it (their own) interpretation. but none knows its interpretation except Allah, and those who are firmly rooted in knowledge say: We believe in it, it is all from our Lord; and none do mind except those having understanding.

(2) Allah makes to pass away and establishes what He pleases, and with Him is the basis of the Book.