Exodus 19:7-8

19:7 So Moses came and summoned the elders of Israel. He set before them all these words that the Lord had commanded him, 19:8 and all the people answered together, “All that the Lord has commanded we will do!” ¹  So Moses brought the words of the people back to the Lord.

[19:8]  ¹ tn The verb is an imperfect. The people are not being presumptuous in stating their compliance – there are several options open for the interpretation of this tense. It may be classified as having a desiderative nuance: “we are willing to do” or, “we will do.”