Philippians 1:22-24:

But if I live in the flesh, this is the fruit of my labour: yet what I shall choose I wot not.
For I am in a strait betwixt two, having a desire to depart, and to be with Christ; which is far better:
Nevertheless to abide in the flesh is more needful for you.

See also:

Can We Believe for a Dead Person to be Raised?
Is There an Appointed Time for Each Person to Die?
Is It Scriptural to Pray in Agreement with a Suffering Person That He Will Die?
Objection: If You Could Always Get Healed, You Would Live Forever