SB 5.3.1

śrī-śuka uvāca
nābhir apatya-kāmo ’prajayā merudevyā bhagavantaṁ yajña-puruṣam avahitātmāyajata.
Synonyms: 
śrī-śukaḥ uvāca — Śukadeva Gosvāmī said; nābhiḥ — the son of Mahārāja Āgnīdhra; apatya-kāmaḥ — desiring to have sons; aprajayā — who had not given birth to any children; merudevyā — with Merudevī; bhagavantam — the Supreme Personality of Godhead; yajña-puruṣam — Lord Viṣṇu, the master and enjoyer of all performances of sacrifice; avahita-ātmā — with great attention; ayajata — offered prayers and worshiped.
Translation: 
Śukadeva Gosvāmī continued to speak: Mahārāja Nābhi, the son of Āgnīdhra, wished to have sons, and therefore he attentively began to offer prayers and worship the Supreme Personality of Godhead, Lord Viṣṇu, the master and enjoyer of all sacrifices. Mahārāja Nābhi’s wife, Merudevī, who had not given birth to any children at that time, also worshiped Lord Viṣṇu along with her husband.