Shiva Purana
तस्माद्वै देवयजनं सर्वाभीष्टफलप्रदम् । समंत्रकं ब्राह्मणानामन्येषां चैव तांत्रिकम् ४१ ।
Hence the worship of gods bestows all desired fruits. The worship conducted by brahmins must be along with mantras and by means of gesticulations in the case of others.
english translation
tasmAdvai devayajanaM sarvAbhISTaphalapradam । samaMtrakaM brAhmaNAnAmanyeSAM caiva tAMtrikam 41 ।
hk transliteration by Sanscript