Arthashastra
देवता गृह प्रविष्टस्य उपरि यन्त्र मोक्षणेन गूढ भित्तिं शिलां वा पातयेत् ॥
A wall or a stone, kept by mechanical contrivance, may, by loosening the fastenings, be let to fall on the head of the enemy when he has entered into a temple.
english translation
devatA gRha praviSTasya upari yantra mokSaNena gUDha bhittiM zilAM vA pAtayet ॥
hk transliteration by Sanscript