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Full-version-Shefa-bio-of-Prophet, page : 130
on account of the ultimate intensity of his devotion to Allah. The friendship of Allah to Abraham was that He made him victorious and a role model. On the other hand, there are those who define the root of "khalil", which is "khulla" meaning "in need" as being "a poor person in need". Abraham was known by this title because his need was only in his Lord and he was devotedly dependant upon Him for his needs and did not depend upon others.