LXX Deut 32:2

προσδοκάσθω ὡς ὑετὸς τὸ ἀπόφθεγμά μου, καὶ καταβήτω ὡς δρόσος τὰ ῥήματά μου· ὡσεὶ ὄμβρος ἐπ᾿ ἄγρωστιν, καὶ ὡσεὶ νιφετὸς ἐπὶ χόρτον

Let my teaching fall like rain and my speech settle like dew, like gentle rain on new grass, like showers on tender plants.