Midrash for Genesis 24:8

"in his hand": "in his hand" always connotes "his domain." And though there is no proof for this, it is intimated in (Numbers 21:26) "And he took all his land from his hand", and (Genesis 24:10) "And the servant took ten camels … and all the good of his master in his hand," — whence we infer that "in his hand" always connotes "his domain." "he shall be put to death": by strangulation. You say by strangulation, but perhaps by one of the (other) deaths mentioned in the Torah? Would you say that? This is a principle in the Torah: Any unqualified death mentioned in the Torah — You are not permitted to incline it to severity, but to lenity. These are the words of R. Yoshiyah. R. Yonathan says: Not because it is of lesser severity, but because all "death" unqualified is strangulation. Rebbi says: There is "death" at the hands of heaven and "death" at the hands of man. Just as the first leaves no outward sign, so, the second. From here they ruled: The mitzvah of strangulation, etc.