Ramayana
दत्त्वोवाच ततः शम्भुर्नावज्ञेयमिदं त्वया । अवज्ञातं यदि हि ते मामेवैष्यत्यसंशयः ॥ 7-16-46 ॥
Having given it, Shambhu (Shiva) then said: 'This must never be treated with contempt by you. For if it is held in disrespect by you, it will surely return to me, of this there is no doubt.'
english translation