Reference for Numbers 19:12

ה֣וּא יִתְחַטָּא־ב֞וֹ בַּיּ֧וֹם הַשְּׁלִישִׁ֛י וּבַיּ֥וֹם הַשְּׁבִיעִ֖י יִטְהָ֑ר וְאִם־לֹ֨א יִתְחַטָּ֜א בַּיּ֧וֹם הַשְּׁלִישִׁ֛י וּבַיּ֥וֹם הַשְּׁבִיעִ֖י לֹ֥א יִטְהָֽר׃

the same shall purify himself therewith on the third day and on the seventh day, and he shall be clean; but if he purify not himself the third day and the seventh day, he shall not be clean.

Jastrow

Jastrow

BDB

BDB