Shiva Purana
वरयेच्च सपत्नीकाञ्छैवान्वै ब्राह्मणोत्तमान् । एकं गुरुवरं शिष्टं वरयेत्सांबमूर्तिकम् ४३ ।
For the sake of the worship he shall invite five great devotees of Śiva along with their wives. One of those shall be an excellent preceptor who shall be assigned the Sāmba form.
english translation
varayecca sapatnIkAJchaivAnvai brAhmaNottamAn । ekaM guruvaraM ziSTaM varayetsAMbamUrtikam 43 ।
hk transliteration by Sanscript