Shiva Purana
बिल्वाश्वत्थतुलस्यादिस्थाने संगृह्य मृतिकाम् ॥ द्विषट्वारं निमज्याप्सु तीरं गत्वोपविश्य च ॥ ९ ॥
Placing the clay in the place of bilva, ashvattha, tulasi and other plants. He dipped himself in the water sixty times and went to the shore and sat down.
english translation
bilvAzvatthatulasyAdisthAne saMgRhya mRtikAm ॥ dviSaTvAraM nimajyApsu tIraM gatvopavizya ca ॥ 9 ॥
hk transliteration by Sanscript