When the Trnavarta demon came, Krsna became lighter than the grass so that the demon could carry Him away. This was ananda-cinmaya-rasa, Krsna's blissful, transcendental pleasure

Expressions researched:
"When the Tṛṇāvarta demon came, Kṛṣṇa became lighter than the grass so that the demon could carry Him away. This was ānanda-cinmaya-rasa, Kṛṣṇa's blissful, transcendental pleasure"

Srimad-Bhagavatam

SB Canto 10.1 to 10.13

When the Tṛṇāvarta demon came, Kṛṣṇa became lighter than the grass so that the demon could carry Him away. This was ānanda-cinmaya-rasa, Kṛṣṇa's blissful, transcendental pleasure.

SB 10.7.20, Translation and Purport

While the child was sitting on the ground, a demon named Tṛṇāvarta, who was a servant of Kaṁsa's, came there as a whirlwind, at Kaṁsa's instigation, and very easily carried the child away into the air.

Kṛṣṇa's heaviness was unbearable for the child's mother, but when Tṛṇāvartāsura came, he immediately carried the child away. This was another demonstration of Kṛṣṇa's inconceivable energy. When the Tṛṇāvarta demon came, Kṛṣṇa became lighter than the grass so that the demon could carry Him away. This was ānanda-cinmaya-rasa, Kṛṣṇa's blissful, transcendental pleasure.