Shiva Purana
पूजासदनमागच्छेन्मनसा संस्मरञ्च्छिवम्॥ द्वारमासाद्य प्रक्षाल्य पादौ मौनी द्विराचमेत्॥ ३३॥
Then he shall go to the hall of worship thinking on Śiva. After reaching the door he shall wash his feet silently and perform Ācamana twice.
english translation
pUjAsadanamAgacchenmanasA saMsmaraJcchivam॥ dvAramAsAdya prakSAlya pAdau maunI dvirAcamet॥ 33॥
hk transliteration by Sanscript