Valmiki Ramayana Bala Kanda Sarga 24 Shloka 19

तम् इन्द्रम् Indra, देवा: devatas, स्नापयन् while bathing him, तपोधना: sages possessing asceticism as wealth, ऋषयश्च rishis, कलशै: with waterpitchers, स्नापयामासु: bathed him, अस्य मलम् his impurities, प्रमोचयन् liberated.

Devas and rishis endowed with the wealth of asceticism bathed Indra with the (consecrated) waters (brought from all rivers) from the pitchers and got him cleansed of impurities.