The Will / Bequest
Scholars have said that if one dreams of making a will like that of a wise dying person, it may indicate their diligence in rectifying their religious practice. The rider behind another in a dream may symbolize a successor, and perhaps indicates diligently pursuing the affairs of the one who preceded him.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam
Note: These are traditional scholarly interpretations (ijtihad) drawn from a specific classical source — not a binding religious ruling, fortune-telling, or a prediction of the future.