Shiva Purana
तदुपर्य्यासनं रम्यं कल्पयित्वा विधानतः ॥ तत्र संस्थापयेच्छिष्यं शिशुं सानुकूलतः ॥ ३५ ॥
Then a beautiful seat shall be put over the square in accordance with the rules. He shall then make the boy disciple sit on it in a comfortable posture.
english translation
taduparyyAsanaM ramyaM kalpayitvA vidhAnataH ॥ tatra saMsthApayecchiSyaM zizuM sAnukUlataH ॥ 35 ॥
hk transliteration by Sanscript