There is evidence that the holy Prophet Muhammad (صلى الله عليه وسلم) supplicated in the following words:
اللهم احيني مسكينا و أمتني مسكيناً و احشرني في زمرة المساكين.
?O Allah let me live as poor and let me die as poor, and raise me among the poor.?
As for his progeny, I do not remember any dua which applies all the sayyids (until the Day of Judgment).
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband