Kissing the Kotel
Moshe and Aaron passed away in the highest way possible, with a kiss. Hashem kissed them and their souls left their bodies and passed on into the next world. But what is a kiss?
A kiss is more than a simple act of affection. When we love someone or something we show that love by placing our lips on what we love and then we reach out our lips to come even closer to them, and then we kiss.
But a kiss is even more than just warmly and tenderly touching our beloved. After we place our lips on what we love, be it a family member, our tefillin, or a mezuzah, we draw our breath back into ourselves as if pulling our beloved into our very bodies.
And this is what Hashem does to the tzaddikim when they leave this world. Hashem draws their souls back into Himself with His breath.