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.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
स च कदाचित्पितृलोककामः सुरवरवनिताक्रीडाचलद्रोण्यां भगवन्तं विश्वसृजां पतिमाभृतपरिचर्योपकरण आत्मैकाग्र्येण तपस्व्याराधयाम्बभूव
sa ca kadācitpitṛlokakāmaḥ suravaravanitākrīḍācaladroṇyāṃ bhagavantaṃ viśvasṛjāṃ patimābhṛtaparicaryopakaraṇa ātmaikāgryeṇa tapasvyārādhayāmbabhūva
SB 5.2.2