Why turba is made only from soil of grave of imam hussain a.s, why not from soil from kabba. or other holy places

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We do have turbah made from other places such as the shrine of Imam Ridha (as). However the land of Karbala has special merit in our narrations

For example,

In Mifatihul Jinan by Sheikh Abbas Al-Qummi we find the following about the merits of Turbah: Imam Rida (as) said “Whoever uses the rosary made of the clay of Imam Hussain’s (as) tomb repeating the following statements with each bead Almighty Allah shall record for him six thousand excellent points, erase six thousand evil doings of him, raise him six thousand ranks and decide for him six thousand times of intercession.

* • Subhanallah (Glory be to Allah)
* • Al-Hamdu lillah (Praise be to Allah)
* • Laa ilaha illa allah (There is no god but Allah)
* • Allahu Akbar (God is the Greatest)”
Imam Sadiq (as) said “Whoever uses the rosary made of the clay of Imam Hussain’s (as) tomb imploring for Almighty Allah’s forgiveness one time only, shall be considered to have implored his forgiveness seventy times. Whoever holds in his hand such a rosary without uttering any statement of glorification, shall be considered to have uttered seven statements of glorification for each bead.”