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As Jesus was going to the cross, some of the people were weeping. He turns to them and says that they shouldn't weep for him, but they should weep for their children because of the days that are coming. He prophecies that their children will then “say (ἄρξονται λέγειν) to the mountains, ‘Fall on us!’ and to the hills, ‘Cover us!’”
From a grammatical point of view, it's worth noting that almost every major translation translates both ἄρξονται and λέγειν as “begin to say.” Only the NIV and NLT don't convey the inceptive idea — “to begin”: “they will say to the mountains”; “People will beg the mountains.”