Rujukan Talmud untuk Bilangan 35:21: Jerusalem Talmud Sanhedrin, Makkot & Sanhedrin

HALAKHAH: “A murderer who attacked someone,” etc. It is written²⁰Num. 35:17.: If he hit him with a lethal stone in his hand so that he died, (the hitter shall die, he is a murderer,)²¹Num. 35:21; the quote is not appropriatethe murderer shall be put to death. Or he hit him with a lethal wooden implement in his hand so that he died, the murderer shall be put to death²²Num. 35:18.. When He comes to iron²³Num. 35:16. Babli 76b., He does not speak of lethal or not lethal, but even a small hook when applied to the esophagus could kill him; but a stone must be lethal, wood must be lethal²⁴Prosecution of murder with a stone or wood is possible only if the stone or wood can be classified as lethal; otherwise the murderer can claim that the slain person was the victim of an accident.. If he put him in front of a horse²⁵In the following cases, it is presumed that the murderer somehow immobilized his victim. In these cases, the murderer is guilty if the horse already was galloping, or the arrow or spear already flying, etc. Then the action of the murderer is murder. But according to the Mishnah, tying a person as a target for other people’s future shots is indirect causation. Babli 77a., in front of an arrow, in front of a spear, put him out in the cold, gave him bad water to drink, removed the ceiling over him and the rains came down and killed him, or he opened a water canal whose waters swept over him²⁶It is murder if the first wave of water is lethal..

From where do we learn this rule [that zomemim aren't liable if the victim had no verdict] by exile? The Torah uses a gezariah shava of Rotzaich Rotzaich

...However, why must the Seifa permit killing him in any way? We already know this from Rotze'ach! ...What is the source to kill him any other way, if we cannot give the proper Misah? ...Rotze'ach is an exception.