Vaisesika Sūtras
Vaisesika Sūtra 7.2.05
भ्रान्तं तत् ॥५॥
bhrāntaṁ tat ॥5॥
[भ्रान्तम् (bhrāntam) - deluded; तत् (tat) - that;]
That is a delusion.