Śrīmad-Bhāgavatam 1.6.30
Blended reading (Sanskrit + English inline)
The duration of a day in the life of Brahmā is 4,320,000,000 solar years. This is stated also in the Bhagavad-gītā. So for this period Brahmājī rests in yoga-nidrā within the body of the Garbhodakaśāyī Viṣṇu, the generator of Brahmā. Thus after the sleeping period of Brahmā, when there is again creation by the will of the Lord through the agency of Brahmā, all the great ṛṣis again appear from different parts of the transcendental body, and Nārada also appears. This means that Nārada appears in the same transcendental body, just as a man awakes from sleep in the same body. Śrī Nārada is eternally free to move in all parts of the transcendental and material creations of the Almighty. He appears and disappears in his own transcendental body, which is without distinction of body and soul, unlike conditioned beings.
At the end of thousand yuga cycles means “at the end of the previous kalpa and the beginning of this kalpa.” Marīci and other sages (marīci-miśrā) and I were born from the senses of Brahmā. [Note: Jīva Gosvāmī explains that their birth is actually awakening from sleep only. Nārada has an eternal body, but sometimes special jīvas take up the form of Nārada as well. ] Jajṣire instead of jajṣimaha is poetic license.
My note
Source: vedabase.io