Visuddhimagga VIII-50

Karontena ca tacapañcakādīni paricchinditvā anulomapaṭilomavasena sajjhāyo kātabbo.

那读诵者当先分发皮的五种来顺逆的读诵。

Ñ(VIII,50): Now when he does the recitation, he should divide it up into the 'skin pentad', etc., and do it forwards and backwards.

Kesā lomā nakhā dantā tacoti hi vatvā puna paṭilomato taco dantā nakhā lomā kesāti vattabbaṃ.

即顺读：「发、毛、爪、齿、皮」以后，再逆诵：「皮、齿、爪、毛、发」。

Ñ: After saying 'Head hairs, body hairs, nails, teeth, skin', he should repeat it backwards, 'Skin, teeth, nails, body hairs, head hairs'.