Firewood becomes ash, and it does not become firewood again. Yet, do not suppose that the ash is future and the firewood past.
You should understand that firewood abides in the phenomenal expression of firewood, which fully includes past and future and is independent of past and future. Ash abides in the phenomenal expression of ash, which fully includes future and past.
Just as firewood does not become firewood again after it is ash, you do not return to birth after death.
This being so, it is an established way in buddha-dharma to deny that birth turns into death. Accordingly, birth is understood as no-birth. It is an unshakable teaching in Buddha’s discourse that death does not turn into birth. Accordingly, death is understood as no-death.
Birth is an expression complete this moment. Death is an expression complete this moment. They are like winter and spring. You can not say that winter becomes spring, or that spring becomes summer.

(Genjōkōan)