On 8 Dhu i-Hijja, participants in this ritual chant "Labbayka" on top of the Rahma Mountain. On 13 Dhu, one may throw three stones on the jamrats, and one must perform the last umra. On the nominal last day of this event, participants sacrifice a goat, which introduces the festival of Id al-Kabir. One ritual associated with this observance is the wearing of an irahm, which makes one mirahm, and refers to dressing oneself in a white robe, and on 7 Dhu i-Hijja, one must spend the day praying in the Great Mosque in the destination associated with this observance.  For ten points, identify this pillar of Islam, which refers to the requirement to travel to Mecca at least 
On 8 Dhu i-Hijja, participants in this ritual chant "Labbayka" on top of the Rahma Mountain. On 13 Dhu, one may throw three stones on the jamrats, and one must perform the last umra. On the nominal last day of this event, participants sacrifice a goat, which introduces the festival of Id al-Kabir. One ritual associated with this observance is the wearing of an irahm, which makes one mirahm, and refers to dressing oneself in a white robe, and on 7 Dhu i-Hijja, one must spend the day praying in the Great Mosque in the destination associated with this observance.  For ten points, identify this pillar of Islam, which refers to the requirement to travel to Mecca at least once.
On 8 Dhu i-Hijja, participants in this ritual chant "Labbayka" on top of the Rahma Mountain.
{hajj} (prompt on “journey to Mecca” or similar)