As a long drought nears its expected end, a sharp contrast emerges between the reactions of the king and the prophet. Confident in the earlier promise that rain is finally coming, King Ahab turns his attention to his physical needs, going to eat and drink [מלבי״ם]. He may have boarded his chariot to travel to Jezreel, pausing only to see what would happen next, or he simply retreated from the river to his tent [רד״ק]. In stark contrast, Elijah ascends to the very peak of Mount Carmel to engage in intense prayer [מצודת דוד].
The prophet chooses this high vantage point either to carefully watch for rain clouds gathering from the west, or because the pure, clear air of the mountain summit makes it a more fitting environment to pray and connect with God [רלב״ג]. Even though God has already promised to send rain, the primary approach among commentators is that Elijah prays to speed up the process. He asks for the rain to fall immediately and miraculously while Ahab is still present to witness it.
To secure this divine promise, Elijah adopts a posture of deep physical and spiritual humility. He bends down toward the earth [רש״י, מצודת ציון, ביאור שטיינזלץ] and places his face between his knees. This specific stance serves multiple purposes. It helps him achieve a state of deep concentration [ביאור שטיינזלץ], while also expressing profound submission and modesty, ensuring his prayer is heard and his distress is eased [רלב״ג].
There are different ways to understand exactly how Elijah positioned himself. One perspective suggests a sequence of movements. In this view, he first bows completely to the ground, and then sits to place his face between his knees, refusing to rise until a sign of rain appears [מצודת דוד, רד״ק]. Another approach explains this as a single, combined position. Rather than spreading his arms and legs out flat, he simply bows low to the ground with his face tucked tightly between his knees [רד״ק].