Mantra 2

वर्षति हास्मै वर्षयति ह य एतदेवं विद्वान्वृष्टौ पञ्चविधंसामोपास्ते ॥ २.३.२ ॥

In plain words

It rains for him, and he makes it rain, who knowing this worships the fivefold Sāman in rain.