Srimad Bhagavatam Canto 11, Chapter 27, Text 09

SB 11.27.9

arcayam sthandile ’gnau va
 surye vapsu hrdi dvijah
dravyena bhakti-yukto ’rcet
 sva-gurum mam amayaya
 
Translation: 
 
A twice-born person should worship Me, his worshipable Lord, without duplicity, offering appropriate paraphernalia in loving devotion to My Deity form or to a form of Me appearing upon the ground, in fire, in the sun, in water or within the worshiper’s own heart.

 

Srimad Bhagavatam Canto 11, Chapter 27, Text 08
Srimad Bhagavatam Canto 11, Chapter 27, Text 10