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Marking the Sacrificial Animal and Garlanding It
Ish'ar (or marking) means that a camel or cow to be slaughtered is marked by cutting off their humps on one side. This serves as a mark that they are intended for sacrifice so that no one should cause them any harm.
And taqlid or garlanding means putting a leather piece around the sacrificial animal's neck to mark it as such.
The Prophet (peace be upon him) garlanded the sheep that he had marked out for slaughtering and sent them with Abu Bakr to Makkah when he performed Hajj in the 9th year after Hijrah. It is affirmed by ahadith that the Prophet (peace be upon him) garlanded sacrificial animals, marked them and doned ihram for 'Umrah at the time of Hudaibiah.
Most scholars, except Abu Hanifah, hold that marking the sacrificial animal is desirable.
Wisdom Behind Ish'ar and Taqlid
The wisdom behind these two acts concerns reverence for Allah's commands, and an expression of that reverence, besides serving as a means of informing people that these animals are on their way to the House of Allah to be slaughtered there for His pleasure.
Riding the Sacrificial Animals
It is permissible to ride and benefit from the sacrificial animals (e.g., camels or cows). Allah says in the Qur'an (22.33): "In them (i.e., animals) you have benefits for a term appointed. In the end their place of sacrifice is near the Ancient House."
Dahak and 'Ata said: "Benefiting from them here means using them for riding when needed, and benefiting from their milk and wool." The phrase "appointed term" refers to the term when a pilgrim marks the animal for sacrifice until it is slaughtered. And the words "In the end their place is near the Ancient House" refer to the Day of Slaughter or Sacrifice (Nahr), the 10th of Dhul-Hijjah.
Abu Hurairah reported that the Prophet (peace be upon him) saw a man driving a she-camel to the place of slaughter. The Prophet (peace be upon him) said to the man, "Mount it." The man replied, "It is a sacrificial animal." The Prophet (peace be upon him) said to him twice or thrice, "Woe be to you ! Mount it." This is reported by Bukhari, Muslim, Abu Daw'ud
"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari