Hazrat Mahdi (as) will not spill blood

People will seek refuge in Hazrat Mahdi (as) as honeybees cluster around their sovereign. HE WILL FILL THE WORLD THAT WAS ONCE FULL OF CRUELTY WITH JUSTICE. HIS JUSTICE WILL BE AS SUCH THAT HE WILL NOT WAKE A SLEEPING PERSON OR EVEN SHED ONE DROP OF BLOOD. THE EARTH WILL RETURN TO THE AGE OF BLISS. (Ibn Hajar al-Haythami, Al-Qawl al-Mukhtasar fi `Alamat al-Mahdi al-Muntadhar, p. 29)

Hazrat Mahdi (as will follow the way of the Prophet (saas). He will not wake up a sleeping person or SHED BLOOD. (Al-Barzanji, Al-Isha'ah li-ashrat al-sa'ah, p. 163)

In the time of [Hazrat Mahdi (as)] no one will be woken up from their sleep OR HAVE A BLEEDING NOSE. (Ibn Hajar al-Haythami, Al-Qawl al-Mukhtasar fi `Alamat al-Mahdi al-Muntadhar, p. 44)

Those swearing allegiance to him [Hazrat Mahdi (as)] will swear allegiance between Rock and Pillar (around Ka’bah). They never wake a sleeping person, NEVER SHED BLOOD. (Ibn Hajar al-Haythami, Al-Qawl al-Mukhtasar fi `Alamat al-Mahdi al-Muntadhar, p. 24)

LIKE THE CUP FILLS WITH WATER, SO WILL EARTH FILL WITH PEACE. There will be no enmity left between any people. All hostility, fighting, and envy will surely disappear. (Sahih Muslim, 1/136)

... In the same way that Almighty Allah began Islam with us, so He will bring it to an end with him [Hazrat Mahdi (as)]. In the same way that they were freed from polytheism and enmity and their hearts were filled with friendship and love through me, so it will be again with the coming of Hazrat Mahdi (as). (Al-Muttaqi al-Hindi, Al-Burhan fi Alamat al-Mahdi Akhir az-Zaman, p. 20)