▼ The construct has “young men of the Israelites,” and so “Israelite” is a genitive that describes them.

▼ The verbs and their respective accusatives are cognates. First, they offered up burnt offerings (see Lev 1), which is וַיַּעֲלוּ עֹלֹת (vayya’alu ’olot); then they sacrificed young bulls as peace sacrifices (Lev 3), which is in Hebrew וַיִּזְבְּחוּ זְבָחִים (vayyizb^ekhu z^evakhim). In the first case the cognate accusative is the direct object; in the second it is an adverbial accusative of product. See on this covenant ritual H. M. Kamsler, “The Blood Covenant in the Bible,” Dor le Dor 6 (1977): 94-98; E. W. Nicholson, “The Covenant Ritual in Exodus 24:3–8, ” VT 32 (1982): 74-86.