Srimad-Bhagavatam: Canto 6 - Chapter 1 - Verse 6
ब्रह्महत्यामञ्जलिना जग्राहयदपीश्वर: ।संवत्सरान्ते तदघं भूतानां सविशुद्धये ।भूम्यम्बुद्रुमयोषिद्भ्यश्चतुर्धा व्यभजद्धरि: ॥ ६ ॥
brahma-hatyām añjalinājagrāha yad apīśvaraḥsaṁvatsarānte tad aghaṁbhūtānāṁ sa viśuddhayebhūmy-ambu-druma-yoṣidbhyaścaturdhā vyabhajad dhariḥ
Although Indra was so powerful that he could neutralize the sinful reactions for killing a brāhmaṇa, he repentantly accepted the burden of these reactions with folded hands. He suffered for one year, and then to purify himself he distributed the reactions for this sinful killing among the earth, water, trees and women.