שלשלת

At the end of this week's parsha, we are described the ceremony of the consecration of the kohanim. As part of the proceedings, Moshe brought three korbanos: a chatas, an olah, and the eil hamiluim. In the pasuk that deals with the slaughtering of the last korban, (8:23), the note on the word "vayishchat" is the unique shalsheles, found only in four places in the Torah and three others in the rest of NA"CH.

R' Chaim Kanievsky explains why specifically this of the three korbanos has a shalsheles on the word "vayishchat." He says he saw in a sefer that a shalsheles denotes an extension or elongation of whatever word it is on. For instance, as Sedom was about to be destroyed, Lot lingered and did not go along with the angels. The pasuk (Bereishis 19:17) says "vayismahmah," with a shalsheles, for he lingered excessively.

Here, the other two korbanos required only a spilling of the blood on the mizbeiach. The last korban, however, in addition to the spilling of blood on the mizbeiach required also the putting of blood on the thumb and big toe of Aharon and his four sons. Therefore, Moshe required to deal at greater length with the slaughtering of this korban so that he could make sure enough blood was gathered for all the necessary tasks. This is why there is a shalsheles on the word "vayishchat."