Reference for Sanhedrin 207:4
ומשרה שכינה על נביאי הבעל מחבירו של עדו הנביא דכתיב (מלכים א יג, כ) ויהי הם יושבים אל השלחן ויהי דבר ה' אל הנביא אשר השיבו
'And an unwitting offence in connection therewith is accounted as deliberate' — for Rab Judah said in Rab's name: Had but Jonathan given David two loaves of bread for his travels, Nob, the city of priests would not have been massacred, Doeg the Edomite would not have been destroyed,<span class="x" onmousemove="('comment',' V. p. 640, n. 5. ');"><sup>7</sup></span> and Saul and his three sons would not have been slain.<span class="x" onmousemove="('comment',' For had he provided him with food, he would not have taken any from Ahimelech. Thus, all this happened, though Jonathan's initial offence was due to an oversight. ');"><sup>8</sup></span>