לְמַ֨עַן טְבֹ֤חַ טֶ֙בַח֙ הוּחַ֔דָּה לְמַעַן־הֱיֵה־לָ֥הּ בָּ֖רָק מֹרָ֑טָּה א֣וֹ נָשִׂ֔ישׂ שֵׁ֥בֶט בְּנִ֖י מֹאֶ֥סֶת כָּל־עֵֽץ׃
כּדי צו האָבן אַ בליץ איז זי געשליפֿן –װײ, עס פֿאַרגײט דער שטאַם פֿון מײַן זון! –זי פֿאַרלענדט דעם גאַנצן בױם.
Rashi
that it may glitter Heb. בָּרָק, to have a glitter, a shine, flandours, a flash, flashing (as in Deut 32: 41).
Rashi
Shall we rejoice? This is a rhetorical question. Do we have anything more to be happy about?
Rashi
The rod for My son disdains every stick The rod with which I strike My son to chastise him is the hardest of all rods, and it disdains the blow of every staff and every stick, for they are like nothing to it.