(יג) לֹ֥֖א תִּֿרְצָ֖͏ֽח׃
(13) You shall not murder.
לא תרצח, “do not murder!” The absence of any qualifying adjectives or adverbs means that murder by hand, by tool, or even by silence is equally forbidden. Example: you have obtained information that someone is about to be murdered and you fail to warn the prospective victim. The expression רצח is not applicable unless applied to death caused by illegal means. The expressions מיתה, or הריגה can be applied to death by other means whether legal or illegal.
THOU SHALT NOT MURDER. With your hand or your tongue, that is, by giving false testimony which results in having someone executed, or by tale bearing, or by wickedly giving someone counsel which you know will result in his death, or by not revealing a secret which you are aware of, to someone who would be saved if he knew what you know. If you do not reveal the secret you are a murderer.
עַמִּי בְּנֵי יִשְרָאֵל לָא תֶהֱווּן קְטוֹלִין לָא חַבְרִין וְלָא שׁוּתְּפִין עִם קְטוֹלִין וְלָא יִתְחָמֵי בִּכְנִשְׁתְּהוֹן דְּיִשְרָאֵל עִם קְטוֹלִין וְלָא יְקוּמוּן בְּנֵיכוֹן מִן בַּתְרֵיכוֹן וְיִלְפוּן לְחוֹד הִינוּן לְמֶהֱוֵי עִם קְטוֹלִין אֲרוּם בְּחוֹבֵי קְטוֹלַיָא חַרְבָּא נָפִיק עַל עַלְמָא:
My people, the sons of Israel, You. shall not be murderers; you shall not be companions of or partakers with murderers: in the congregations of Israel there shall not be seen a murderous people; neither shall your sons rise up after you and teach one another to take part with murderers: for on account of the guilt of murder the sword cometh forth upon the world:
הרוצח ממעט הדמות הנעשה בצלם אלהים, ונשמתו היתה בבטן האם
The murderer definitely diminishes God's image, seeing that God had imparted His image to man when He created him in His image and His likeness. Man's God-given soul was already within the womb of his mother before he was born.