וַיַּֽעֲזָר־לוֹ֙ אֲבִישַׁ֣י בֶּן־צְרוּיָ֔ה וַיַּ֥ךְ אֶת־הַפְּלִשְׁתִּ֖י וַיְמִיתֵ֑הוּ אָ֣ז נִשְׁבְּעוּ֩ אַנְשֵׁי־דָוִ֨ד ל֜וֹ לֵאמֹ֗ר לֹא־תֵצֵ֨א ע֤וֹד אִתָּ֙נוּ֙ לַמִּלְחָמָ֔ה וְלֹ֥א תְכַבֶּ֖ה אֶת־נֵ֥ר יִשְׂרָאֵֽל׃ (פ)
Porém, Abisai, filho de Zeruia, o socorreu; e, ferindo ao filisteu, o matou. Então os homens de Davi lhe juraram, dizendo: Nunca mais sairás conosco à batalha, para que não apagues a lâmpada de Israel.
Akeidat Yitzchak
We observe in nature, that the more important and precious an item, the greater the precautions taken to insure its protection against damage or destruction. We observe the same phenomenon when examining certain parts of Torah legislation. An army assigns extra soldiers and guards to insure the safety of its commander-in-chief. When David had aged, his officers became concerned about his continued participation in battle, since protecting him would require extra efforts. They could not risk that he should be harmed. (Samuel I, chapter 21) Similarly, we find that nature has enclosed vital organs such as heart lung and liver in a protective cage within the body, to afford maximum protection for those organs. Proverbs 4, 23, tells us "more than anything else, protect your heart, because it is the fountain of life." There are numerous other verses throughout the Bible, containing similar messages, referring also to the brain. Torah legislation that concerns itself with fundamental concepts is repeated over and over. It is safeguarded in such manner against violation. Even acts that could lead indirectly to violation of the fundamental concepts, are prohibited. To preserve the concept of "I am the Lord your G'd" intact, the legislation calling for Sabbath and holiday observances ensures that the concept of anochi is ever present in our thoughts and deeds. Penal legislation is especially harsh when it concerns any vital concept of our faith.