SB 11.27.14
Devanāgarī
अस्थिरायां विकल्प: स्यात् स्थण्डिले तु भवेद् द्वयम् । स्नपनं त्वविलेप्यायामन्यत्र परिमार्जनम् ॥ १४ ॥
Text
asthirāyāṁ vikalpaḥ syāt sthaṇḍile tu bhaved dvayam snapanaṁ tv avilepyāyām anyatra parimārjanam
Synonyms
asthirāyām—in the case of the temporarily installed Deity;vikalpaḥ—an option (as to whether the Deity is to be called and sent away);syāt—there is;sthaṇḍile—in the case of the Deity traced upon the ground;tu—but;bhavet—do occur;dvayam—these two rituals;snapanam—the bathing;tu—but;avilepyāyām—in the case when the Deity is not made out of clay (or paint or wood);anyatra—in the other cases;parimārjanam—thorough cleansing, but without water.
Translation
The Deity that is temporarily established can optionally be called forth and sent away, but these two rituals should always be performed when the Deity is traced upon the ground. Bathing should be done with water except if the Deity is made of clay, paint or wood, in which cases a thorough cleansing without water is enjoined.
Purport
The śālagrāma-śilā is considered to be automatically installed even without the formal ceremony, and so it is forbidden to call the Deity with mantras or ask the Deity to leave. On the other hand, if one prepares a Deity form by drawing on sanctified ground or by constructing a sand image, one must call the Deity with mantras and then ask the Deity to leave the external form, which will soon be demolished by the natural elements.
The general principle is that a pure devotee of the Lord understands his relationship with the Deity to be eternal. The more one surrenders in loving devotion to the Deity, the more one can understand the Supreme Personality of Godhead. Lord Kṛṣṇa is a person, but He is the Supreme Person, possessing His own unique feelings. One can easily please the Lord by devotional service offered to His Deity form. By pleasing the Lord one can gradually progress in the mission of human life and eventually go back home, back to Godhead, where the Deity personally appears before the devotee and welcomes the devotee to His personal abode, known throughout the world as the kingdom of God.