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Śrīmad-Bhāgavatam
[Canto 5, Ch. 2]
sa ca kadācit pitṛloka-kāmaḥ sura-vara-vanitākrīḍācala-droṇyāṁ bhagavantaṁ viśva-sṛjāṁ patim ābhṛta-paricaryopakaraṇa ātmaikāgryeṇa tapasvy ārādhayām babhūva.
saḥ—he (King Āgnīdhra); ca—also; kadācit—once upon a time; pitṛloka—the Pitṛloka planet; kāmaḥ—desiring; sura-vara—of the great demigods; vanitā—the women; ākrīḍā—the place of pastimes; acala-droṇyām—in one valley of the Mandara Hill; bhagavantaṁ—unto the most powerful (Lord Brahmā); viśva-sṛjāṁ—of personalities who have created this universe; patim—the master; ābhṛta—having collected; paricaryā-upakaraṇaḥ—ingredients for worship; ātma—of the mind; eka-agryeṇa—with full attention; tapasvī—one who executes austerity; ārādhayām babhūva—became engaged in worshiping.
TRANSLATION
Desiring to get a perfect son and become an inhabitant of Pitṛloka, Mahārāja Āgnīdhra once worshiped Lord Brahmā, the master of those in charge of material creation. He went to a valley of Mandara Hill, where the damsels of the heavenly planets come down to stroll. There he collected garden flowers and other necessary paraphernalia and then engaged in severe austerities and worship.
PURPORT
The King became  pitṛloka-kāma , or desirous of being transferred to the planet named Pitṛloka. Pitṛloka is mentioned in  Bhagavad-gītā  ( yānti deva-vratā devān pitṛn yānti pitṛ-vratāḥ ). To go to this planet, one needs very good sons who can make offerings to Lord Viṣṇu and then offer the remnants to their forefathers. The purpose of the  śrāddha  ceremony is to please the Supreme Personality of Godhead, Lord Viṣṇu, so that after pleasing Him one may offer  prasāda  to one's forefathers and in this way make them happy. The inhabitants of Pitṛloka are generally men of the  karma-kāṇḍīya , or fruitive activities category, who have been transferred there because of their pious activities. They can stay there as long as their descendants offer them  viṣṇu-prasāda . Everyone in heavenly planets such as Pitṛloka, however, must return to earth after