Srimad-Bhagavatam: Canto 4 - Chapter 1 - Verse 28
Sanskrit:
एवंविधान्यनेकानि त्रासनान्यमनस्विनाम् ।ससृजुस्तिग्मगतय आसुर्या माययासुरा: ॥ २८ ॥
ITRANS:
evaṁ-vidhāny anekānitrāsanāny amanasvināmsasṛjus tigma-gatayaāsuryā māyayāsurāḥ
Translation:
The demon Yakṣas are by nature very heinous, and by their demoniac power of illusion they can create many strange phenomena to frighten one who is less intelligent.