Śrī Caitanya-caritāmṛta - Madhya-līlā 20.279-280

"“These universes are understood to be floating in the air that Mahā-Viṣṇu exhales. They are like atomic particles that float in sunshine and pass through the holes of a screen. All these universes are thus created by the exhalation of Mahā-Viṣṇu, and when Mahā-Viṣṇu inhales, they re-enter His body. The unlimited opulences of Mahā-Viṣṇu are completely beyond material conception."

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Śrī caitanya-caritāmṛta Madhya 20.279-280