Hiranyakeshigrihyasutra 1.3.9.11

1.3.9.11

vaptre pradāyondanīyā apobhimṛśati \ śivā no bhavatha saṃspṛśe \ iti \11\

Having handed over (that razor) to the barber, he touches the water with which his hair is to be moistened, with (the formula), 'Be blissful, (O waters), when we touch you.' [(The barber) then pours together warm and cold water. Having poured warm (water) into cold (water)—]