TgJ Jos7:7 :וְאִלוּ"וְלוֵי" פוֹן דְשָרִינָא וִיתֵיבנָא בְעִברָא דְיַרדְנָא‏ : would that we had gone and stayed on the other side of the Jordan
See the entire entry for ˀe/illū conj. if only