वृष्टौ पञ्चविधं सामोपासीत पुरोवातो हिंकारो मेघो जायते स प्रस्तावो वर्षति स उद्गीथो विद्योतते स्तनयति स प्रतिहार उद्गृह्णाति तन्निधनम् ॥ २.३.१ ॥
In plain words
Let a man worship the fivefold Sāman in rain. The wind that goes before is the hiṃkāra; the cloud that forms is the prastāva; the raining is the udgītha; the lightning and thunder are the pratihāra; the ceasing is the nidhana.