Bhagavad Gita, Chapter 9, Verse 19

As sun, I give heat: I withhold and send forth rain; I am immortality and also death; being and non-being am I, O Arjuna!

Even opposite things, warmth and rain, life and death, are described as coming from the same real source.

This doesn't shy away from naming death alongside immortality, both are claimed directly rather than only the comfortable half. Real completeness is shown here as including the hard parts too.