Ibn Ezra on Exodus 8:10/אבן עזרא על שמות ח׳:י׳

1AND THEY GATHERED. Va-yitzberu (and they gathered) is similar in meaning to the word va-yitzbor (laid up) in And Joseph laid up corn (Gen. 41:49).

2HEAPS. Chomarim chomarim (heaps) is similar in meaning to chamor chamoratayim (heaps upon heaps) (Jud. 15:16).