Deuteronomy 32:1–2, Note the phrases: “words of my mouth,” “my doctrine,” “rain,” “my speech shall distill as the dew,” “small rain” and “showers.” Now read compare these phrases with Eph 5:26. What is Scripture talking about here?
Israel spent 40 years in a dry wilderness. By contrast, the Promised Land was a land flowing with milk and honey and was well-watered. Immediately before and after the giving of the Torah at Mount Sinai (Exod 20), there are references to human thirst and YHVH providing water for his people (Exod 15:22–27; 17:1–7 Num 20:2–1
3). During the Messianic Age (the Millennium), living waters will flow from Jerusalem (Zech 14:8) and those who refuse to come up to Jerusalem for the Feast of Tabernacles (Sukkot) will receive no rain on their land (Zech 14:16–19).
As you relate all these scriptures together, what is the bigger lesson YHVH is trying to teach us here pertaining to water and the word of YHVH?