At-Tawbah 9:42

Law kana AAaradan qareebanwasafaran qasidan lattabaAAooka walakinbaAAudat AAalayhimu ashshuqqatu wasayahlifoona billahilawi istataAAna lakharajna maAAakumyuhlikoona anfusahum wallahu yaAAlamu innahum lakathiboon

Had it been a near [i.e., easy] gain and a moderate trip, they [i.e., the hypocrites] would have followed you, but distant to them was the journey. And they will swear by Allāh, "If we were able, we would have gone forth with you," destroying themselves [through false oaths], and Allāh knows that indeed they are liars.

Had it been a gain at hand or an average journey, they would have certainly followed you, but the distance seemed too far to them. They will swear by Allah: “We would have certainly set out with you, if we were able to.” They are putting themselves to ruin. Allah knows that they are liars.