Midras 1 Samuel 30:1: Vayikra Rabbah & Sifrei Devarim

Rabbi Yehoshua ben Levi interpreted the verse regarding the Amalekites. “When evildoers approach me,” these are the Amalekites, as it is stated: “The Amalekites had raided the South and Tziklag” (I Samuel 30:1).⁴The Amalekites burned Tziklag and took the people who had been there captive, including the wives and children of David and his men. “To consume my flesh” – “David’s two wives were taken captive” (I Samuel 30:5). “My foes and my adversaries are mine” – “David smote them from twilight until evening of the next day [lemoḥoratam]” (I Samuel 30:17). What is lemoḥoratam?⁵The verse could have used the term “the next day [lemoḥorato],” but instead uses the plural term lemoḥoratam, which the midrash interprets as alluding to an additional night. Rabbi Yehoshua ben Levi said: Two nights and one day. Who illuminated for him? The Holy One blessed be He, with shooting stars and lightning. That is what David said: “For You will illuminate my lamp” (Psalms 18:29). From here on, David said: “If a camp” – of Amalekites “besieges me, my heart will not fear.” If war” – with Amalekites – “comes upon me, in this [bezot] I will put my trust” (Psalms 27:3), Rabbi Levi said: In the testament that Moses dictated to us in the Torah, when he said to the elders: “This is [vezot] for Judah.”

"many days": "days" — two; "many" — three. We are hereby taught that peace is offered for two days, and a third day for the battle. And even though there is no proof for this, there is an intimation of it in (I Samuel 30:1) "And David and his men came to Tziklag on the third day." Variantly: From here it is derived that gentile cities are not besieged fewer than three days before the Sabbath, (so that the siege not extend into the Sabbath); but if the siege began, it is not interrupted. And a sea voyage is not begun fewer than three days before the Sabbath. When is this so? For a long voyage, but for a short one, it is permissible.

(We are hereby taught that peace is offered for two days, and a third day before the battle. And so it states: (I Samuel 30:1) "And David Remained in Tziklag for two days." And gentile cities are not besieged fewer than three days before the Sabbath, (so that the siege not extend into the Sabbath); but if the siege began, it is not interrupted. This is one of three lessons taught by Shammai the Elder: A sea voyage is not begun fewer than three days before the Sabbath. When is this so? For a long voyage, but for a short one, it is permissible.)