Visuddhimagga VI-18

Tasmā vuttappakārassa bhikkhuno kathetvā asubhanimittadassane sañjātābhilāsena yathānāma khattiyo abhisekaṭṭhānaṃ, yajamāno yaññasālaṃ, adhano vā pana nidhiṭṭhānaṃ pītisomanassajāto gacchati, evaṃ pītisomanassaṃ uppādetvā aṭṭhakathāsu vuttena vidhinā gantabbaṃ.

所以欲见不净相者，依照前述的方法告知比丘之后，应如剎帝利到灌顶的地方去，又如祭祀者到祭坛去，贫者到宝藏处一样的生起喜悦心而行，既生喜悦心后，当依诸义疏所说的方法去行。

Ñ(VI,18): Therefore he should inform a bhikkhu of the kind described and then set out eager to see the sign, and as happy and joyful as a warrior-noble (khattiya) on his way to the scene of anointing, as one going to offer libations at the hall of sacrifice, or as a pauper on his way to unearth a hidden treasure. And he should go there in the way advised by the Commentaries.