What is the meaning of "And he caused them to journey"? That he made them journey against their will. For it is written, "And he took six hundred chosen chariots" (Exodus 14:7). Pharaoh had arisen and adorned those horses with precious stones and pearls, and when they drowned in the sea, the jewels floated upon the surface of the sea. Israel would go down every day and take from them, and they did not wish to move from there. When Moses saw this, he said to them: "What do you think, that every day the sea will bring up for you precious stones and pearls?" He arose and made them journey against their will.
The Jeweled Horses That Tempted Israel to Linger
Yalkut Shimoni on Torah 254:4
מַהוּ וַיַּסַּע שֶׁהִסִּיעָן בְּעַל כָּרְחָן, דִּכְתִיב (שמות יד, ז) "וַיִּקַּח שֵׁשׁ מֵאוֹת רֶכֶב", עָמַד פַּרְעֹה וְקִשֵּׁט אוֹתָן הַסּוּסִים בַּאֲבָנִים טוֹבוֹת וּמַרְגָּלִיּוֹת, וּכְשֶׁנִּטְבְּעוּ בַּיַּם הָיוּ צָפִין עַל שְׂפַת הַיָּם וְהָיוּ יִשְׂרָאֵל יוֹרְדִין בְּכָל יוֹם וְנוֹטְלִין מֵהֶן וְלֹא הָיוּ מְבַקְּשִׁין לָזוּז מִשָּׁם, כֵּיוָן שֶׁרָאָה מֹשֶׁה כָּךְ, אָמַר לָהֶם מָה אַתֶּם סְבוּרִים שֶׁבְּכָל יוֹם הַיָּם מַעֲלֶה לָכֶם אֲבָנִים טוֹבוֹת וּמַרְגָּלִיּוֹת עָמַד וְהִסִּיעָן בְּעַל כָּרְחָן.