World Wide Study Bible
a Bible passage
15. I am glad for your sakes I was not there—This certainly implies that if He had been present, Lazarus would not have died; not because He could not have resisted the importunities of the sisters, but because, in presence of the personal Life, death could not have reached His friend [Luthardt]. "It is beautifully congruous to the divine decorum that in presence of the Prince of Life no one is ever said to have died" [Bengel].
that ye may believe—This is added to explain His "gladness" at not having been present. His friend's death, as such, could not have been to Him "joyous"; the sequel shows it was "grievous"; but for them it was safe (Php 3:1).