Or HaChaim on Deuteronomy 1:24/אור החיים על דברים א׳:כ״ד

1 ויפנו ויעלו ההרה, They turned and ascended towards the mountain, etc. Moses chose the expression ויפנו, "they turned," to indicate that they departed from the straight and narrow which they had pursued up until that time. Until the mission commenced, all these 12 men had been righteous;, they only turned from what reason dictated at that point. Please compare what I have written on Numbers 13,26.

2וירגלו אותה, "they spied it out." This means that they did not act in accordance with what the Israelites had said to Moses when they explained the mission as ויחפרו לנו את הארץ, "that the spies will spy out the land on our behalf, etc.," but "they spied it out." They wanted to investigate the nature of the land, its people, not where they had hidden their valuables.