Genesis 44:12

12 and he searcheth -- at the eldest he hath begun, and at the youngest he hath completed -- and the cup is found in the bag of Benjamin;

Genesis 44:12 Meaning and Commentary

Genesis 44:12

And he searched
To the bottom of them, not content to look into the mouth of them being opened, but rummaged them, and searched deeply into them to find the cup, which was the thing charged upon them he was solicitous to find; as for the money in the sack's mouth he took no notice of that, nor is there any mention of it: [and] began at the oldest;
at Reuben, as the Targum of Jonathan expresses it: the steward might know their different ages in course, by the order in which they were placed at Joseph's table when they dined with him: and left off at the youngest;
at Benjamin, he ended his scrutiny with him; this method he took partly to hold them in fear as long as he could, and partly to prevent any suspicion of design, which might have been entertained had he went directly to Benjamin's sack: and the cup was found in Benjamin's sack;
where the steward himself had put it, and as it is usually said, they that hide can find.

Genesis 44:12 In-Context

10 And he saith, `Now, also, according to your words, so it [is]; he with whom it is found becometh my servant, and ye are acquitted;'
11 and they hasten and take down each his bag to the earth, and each openeth his bag;
12 and he searcheth -- at the eldest he hath begun, and at the youngest he hath completed -- and the cup is found in the bag of Benjamin;
13 and they rend their garments, and each ladeth his ass, and they turn back to the city.
14 And Judah -- his brethren also -- cometh in unto the house of Joseph, and he is yet there, and they fall before him to the earth;
Young's Literal Translation is in the public domain.