They were physically very strong and expert in fighting, and their aim was to disturb the sacrifices performed by the great sages

Expressions researched:
"They were physically very strong and expert in fighting, and their aim was to disturb the sacrifices performed by the great sages"

Srimad-Bhagavatam

SB Canto 6

They were physically very strong and expert in fighting, and their aim was to disturb the sacrifices performed by the great sages.

SB 6.6.33-36, Translation

Vaiśvānara, the son of Danu, had four beautiful daughters, named Upadānavī, Hayaśirā, Pulomā and Kālakā. Hiraṇyākṣa married Upadānavī, and Kratu married Hayaśirā. Thereafter, at the request of Lord Brahmā, Prajāpati Kaśyapa married Pulomā and Kālakā, the other two daughters of Vaiśvānara. From the wombs of these two wives of Kaśyapa came sixty thousand sons, headed by Nivātakavaca, who are known as the Paulomas and the Kālakeyas. They were physically very strong and expert in fighting, and their aim was to disturb the sacrifices performed by the great sages. My dear King, when your grandfather Arjuna went to the heavenly planets, he alone killed all these demons, and thus King Indra became extremely affectionate toward him.