Dew and rain, Rachamim and Rachamim Rabim.

Two gifts of Mattan Torah: 1) Hashem gave us Himself, 2) He gave us the dew of (for) resurrection. These two gifts are called rain and dew. At Har Sinai and its aftermath even the unearned dew is earned. It is therefore called “Geshem Nidavos”- rain of generosity. Even Moshe benefited from these two gifts.