In most temples there are one or more bells hung from the top, near the entrance. The devotee rings the bell as soon as he enters, thereafter proceeding for darshan of the Lord and prayers. Children love jumping up or being carried high in order to reach the bell. Is it to wake up the Lord ? But the Lord never sleeps. Is it to let the Lord know we have come? He does not need to be told, as He is all – knowing. Is it a form of seeking permission to enter His precinct? It is a homecoming and therefore entry needs no permission. The Lord welcomes us at all times. These why do we ring the bell ? The ringing of the bell produces what is regarded as an auspicious sound. It produces the sound Om, the universal name of the Lord. There should be auspiciousness within and without, to gain the vision of the Lord who is all-auspiciousness. Even while doing the ritualistic aarati, we ring the bell It is sometimes accompanied by the auspicious sounds of the conch and other musical instruments. An added significance of ringing bell, conch and other instruments is that they help drowned any inauspicious or irrelevant noises and comments that might disturb or distract the worshippers in their devotional ardor, concentration and inner peace. As we start the daily ritualistic worship (pooja) we ring the bell, chanting :

"Aagamaarthamtu devaanaam Gamanaarthamtu rakshasaam Kurve ghantaaravam tatra Devataahvaahna lakshanam"

I ring this bell indicating The invocation of divinity, So that virtuous and noble forces Enter (my home and heart); And the demonic and evil forces From within and without, depart.

From
"Why do we"- Swamini Vimalananda & Radhika Krishnakumar