Shiva Purana
अघोरहृदयं तद्वद्वामगुह्यं महेश्वरम् ॥ सद्यपादं च तन्मूर्तिमष्टत्रिंशत्कलामयम् ॥ ३२ ॥
The heart of the ghastly is the left-hand secret of Lord Maheśvara. The immediate foot of that idol is composed of thirty-eight arts.
english translation
aghorahRdayaM tadvadvAmaguhyaM mahezvaram ॥ sadyapAdaM ca tanmUrtimaSTatriMzatkalAmayam ॥ 32 ॥
hk transliteration by Sanscript