In Ezekiel 26:11, this signifies the love of learning or intellectual things. (Arcana Coelestia 3727)

In Revelation 6:2, this signifies the love of understanding the Word. (Apocalypse Revealed 298)

In Zechariah 12:4, this signifies that the intellectual should be filled with falsities. (Arcana Coelestia 2383[2])

In general, 'a horse' signifies knowledge or understanding of the Word. In an opposite sense it signifies the understanding of the Word falsified by reasonings, and likewise destroyed from self-derived intelligence. 'A dead horse' signifies no understanding of truth from the Word.

6679. 'And did not do as the king of Egypt spoke to them' means that the intention of those under the influence of falsities was not carried out. This is clear from the meaning of 'did not do as he spoke' as the fact that their intention was not carried out, that is, they were unable to destroy the truths meant by 'the boys', even though their intention was to destroy them by whatever method they could, 6676; and from the meaning of 'the king of Egypt' as separated factual knowledge that is opposed to the Church's truth, dealt with in 6651, thus falsity since that factual knowledge is false.