Because Nahusa, the father of Yayati, molested Indra's wife, Saci, who then complained to Agastya and other brahmanas, these saintly brahmanas cursed Nahusa to fall from the heavenly planets and be degraded to the status of a python

Expressions researched:
"Because Nahuṣa, the father of Yayāti, molested Indra's wife, Śacī, who then complained to Agastya and other brāhmaṇas, these saintly brāhmaṇas cursed Nahuṣa to fall from the heavenly planets and be degraded to the status of a python"

Srimad-Bhagavatam

SB Canto 9

Because Nahuṣa, the father of Yayāti, molested Indra's wife, Śacī, who then complained to Agastya and other brāhmaṇas, these saintly brāhmaṇas cursed Nahuṣa to fall from the heavenly planets and be degraded to the status of a python. Consequently, Yayāti became the king.

SB 9.18.3, Translation

Because Nahuṣa, the father of Yayāti, molested Indra's wife, Śacī, who then complained to Agastya and other brāhmaṇas, these saintly brāhmaṇas cursed Nahuṣa to fall from the heavenly planets and be degraded to the status of a python. Consequently, Yayāti became the king.