Throwing the seven pebbles of Jamarat al-'Aqaba simultaneously
I was commissioned by another person to stone Jamarat al-'Aqaba (one of the three stoning sites) on his behalf during hajj. However, because of the crowds, I threw the stones all at once, but I did not tell him about it. The man later passed away before I could inform him about it.
According to the opinion of the followed four schools of jurisprudence, it is obligatory to throw the pebbles separately and whoever neglects to throw the most number of pebbles on any of the days of stoning must sacrifice an animal.
The inquirer must therefore sacrifice an animal at any of the sites of the Sacred Precinct whether at Mina, Mecca, or Muzdalifa anytime during the year before the next hajj season. The inquirer must do this from his own money because he failed to do the stoning for which he was commissioned until its prescribed time has ended.
And God Almighty knows best.