The journey of the Israelites through the desert was marked by a constant, tragic contradiction. Despite experiencing open miracles and clear evidence of God's presence, their disbelief consistently overshadowed what they witnessed firsthand. Their behavior was a profound display of ingratitude, unfolding through distinct stages of mistrust.
Initially, the people questioned God's fundamental power and ability to provide for their basic needs, such as water and bread [מלבי״ם, מצודת דוד]. Once He proved His capabilities, their doubt shifted. They began to test His will, questioning whether He truly desired to shower them with good and fulfill His promises [מלבי״ם]. This persistent testing was entirely baseless, lacking any justified cause [רש״י].
The true absurdity of their behavior lay in their persistence. They continued to test and challenge God even though they had already seen His deeds with their own eyes [רד״ק, מצודת דוד]. What exactly they witnessed can be understood in two complementary ways. The primary approach among commentators is that this refers to God's miracles and acts of salvation, from the plagues in Egypt and the splitting of the Red Sea to the providing of manna and the splitting of the rock in the desert. God continued to care for them even after they sinned, such as continuing to provide manna after the sin of the Golden Calf. This reality demonstrates that simply receiving God's goodness does not guarantee a person's loyalty, nor does it prevent them from returning to foolish behavior [אלשיך].
On the other hand, some explain that the deeds they witnessed were actually the harsh consequences of their actions. They saw the severe punishments brought upon them for their endless complaints, which ultimately resulted in the death of that entire generation in the desert [אבן עזרא]. Ultimately, both perspectives merge into a single, complete picture. The Israelites experienced the full spectrum of God's response: they saw Him graciously answer their requests, yet they also suffered the severe consequences of their relentless complaining [ביאור שטיינזלץ].