Manasara 6.32

6.32

tulārambhe daśadine dvyaṅgulaṃ ca niṣedhayet
visṛjya dvyaṅgulaṃ madhye cāntye vedamiti smṛtam

at the beginning of Libra, for ten days, he should forbid two digits; / setting aside two digits in the middle, and four at the end, so it is recorded;