Vaisesika Sūtra 2.1.5

त आकाशे न विद्यते ॥५॥

ta ākāśē na vidyatē ॥5॥

[ta = these; ākāśē = in space; na = not; vidyatē = are perceived ॥5॥]

These (form, taste, smell, and touch) are not perceived in space.