This is a small inscription in characters of about the 9th century A.D. which states that this (cave) is the gift of one Pūdi Kaḷari alias Amarūṉṟi-Muttaraiyaṉ.
śrī pūti kaḷari Āyiṉa Amaruṉṟimuttaraiyaṉ
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Digital edition of SII 23.142 by