סוּסִ֥ים מְיֻזָּנִ֖ים מַשְׁכִּ֣ים הָי֑וּ אִ֛ישׁ אֶל־אֵ֥שֶׁת רֵעֵ֖הוּ יִצְהָֽלוּ׃
Comme des chevaux repus, ils courent de côté et d’autre, hennissant chacun après la femme d’autrui.
Rashi on Jeremiah
Like armed stallions they would arise early Like these stallions who are armed with erect membra, every morning they would arise at daybreak.
Rashi on Jeremiah
they would neigh Heb. יצהלו. This too is an expression appropriate for horses. Comp. (8:16) “From the sound of the neighing (מצהלות) of his steeds,” an expression of shouting (esjodement in O.F.).