Bhagavatapurana 3.28.25.p2

3.28.25.p2

vakṣo 'dhivāsam ṛṣabhasya mahā-vibhūteḥ $ puṃsāṃ mano-nayana-nirvṛtim ādadhānam &

26. He should meditate upon the chest of the Lord which is the abode of the glorious Lakshmi and which brings delight to men's minds and eyes, and also on the neck of the Lord who is bowed to by all the worlds—the neck which adds beauty to the jewel called Kaustabha (worn about it), (and which brings delight to men's minds and eyes).