וְאִ֡ם בְּאֶ֣בֶן יָד֩ אֲשֶׁר־יָמ֨וּת בָּ֥הּ הִכָּ֛הוּ וַיָּמֹ֖ת רֹצֵ֣חַֽ ה֑וּא מ֥וֹת יוּמַ֖ת הָרֹצֵֽחַ׃
And if he smote him with a stone in the hand, whereby a man may die, and he died, he is a murderer; the murderer shall surely be put to death.
Read kabbalistic (mystical) interpretation of Numbers 35:17: and classical mystical sources.