The hadeeth which says “there is no siyaahah in Islam” is not saheeh
Question

                How sound is the hadeeth “There is no siyaahah (travel by wandering ascetics) in Islam”?
Praise be to Allah. 
          It says in the hadeeth narrated by ‘Abd al-Razzaaq in 
          his  Musannaf from Layth from Taawoos that the Messenger of Allaah 
          SAWS (peace and blessings of Allaah be upon him) said: “… there is no 
          travel by wandering ascetics, no hermitage and no monasticism in Islam.” 
          Al-Albaani said in Da’eef al-Jaami’, “(It is) da’eef.” (no. 6287)
 
          What is saheeh is that which was narrated by Abu Dawood 
          in his Sunan from the hadeeth of Abu Umaamah, that the Prophet 
          SAWS (peace and blessings of Allaah be upon him) said: “The siyaahah 
          (travel of wandering ascetics) of my ummah is jihaad for the sake of 
          Allaah.”
 
          (Classed as saheeh in Saheeh al-Jaami’, no. 2093)
 
          The word saa’ihaat (translated as “emigrants”) in the 
          aayah:
“Muslims (who submit 
          to Allaah), believers, obedient (to Allaah), turning to Allaah in repentance, 
          worshipping Allaah sincerely, given to fasting or emigrants [saa’ihaat] 
          (for Allaah’s sake), previously married and virgins”
 
          [al-Tahreem 66:5 – interpretation of the meaning]
 
          may also mean women who fast, because the word siyaahah has two meanings in the shar’i texts: it may mean jihad or it may mean fasting.
And Allaah knows best.