योगमायोदयं वीक्ष्य मानुषीमीयुषो गतिम् ॥ ३७ ॥
nāradaḥ prahasann iva
mānuṣīm īyuṣo gatim
Having thus seen this display of the Lord’s Yoga-māyā, Nārada mildly laughed and then addressed Lord Hṛṣīkeśa, who was adopting the behavior of a human being.
According to Śrīla Viśvanātha Cakravartī, Nārada fully understood the Lord’s omniscience, and thus when he saw the Lord trying to find out the mood of His ministers, moving about in disguise, Nārada could not help laughing. But remembering the Lord’s supreme position, he somewhat constrained his laughter.