Manusmriti
न संहताभ्यां पाणिभ्यां कण्डूयेदात्मनः शिरः । न स्पृशेच्चैतदुच्छिष्टो न च स्नायाद् विना ततः ॥ ८२ ॥
Let him not scratch his head with both hands joined; let him not touch it while he is impure, nor bathe without (submerging) it.
english translation
na saMhatAbhyAM pANibhyAM kaNDUyedAtmanaH ziraH । na spRzeccaitaducchiSTo na ca snAyAd vinA tataH ॥ 82 ॥
hk transliteration by Sanscript