Shiva Purana
परीक्षार्थं विष्णुभक्तेस्तदा वै शंकरेण ह ॥ कमलानां सहस्रात्तु हृतमेकं च नीरजम् ॥ २०॥
In order to test the piety of Viṣṇu, one of the thousand lotus-flowers was taken away by Śiva.
english translation
parIkSArthaM viSNubhaktestadA vai zaMkareNa ha ॥ kamalAnAM sahasrAttu hRtamekaM ca nIrajam ॥ 20॥
hk transliteration by Sanscript