This hadeeth comes under the following chapter: PERMISSIBILITY OF SAYING NAFL PRAYER ON A RIDING BEAST WHILE ON A JOURNEY, IN WHATEVER DIRECTION IT TURNS
This hadith has been narrated by another chain of transmitters and in the one narrated by Ibn Mubarak and Ibn Abu Za'ida (these words are narrated). Ibn 'Umar then recited:" Whether you turn thither is Allaah's face," and it was revealed in this context.