Shortening the Prayers

Bk. 20: Shortening the Prayers (At−Taqseer)
2.186:
Narrated Ibn `Abbas : The Prophet once stayed for nineteen
days and prayed shortened prayers. So when we travel led (and
stayed) for nineteen days, we used to shorten the prayer but
if we traveled (and stayed) for a longer period we used to
offer the full prayer.
2.187:
Narrated Yahya bin 'Is−haq: I heard Anas saying, "We traveled
with the Prophet from Medina to Mecca and offered two rak`at
(for every prayer) till we returned to Medina." I said, "Did
you stay for a while in Mecca?" He replied, "We stayed in
Mecca for ten days."
2.188:
Narrated `Abdullah bin `Umar: I offered the prayer with the
Prophet, Abu Bakr and `Umar at Mina and it was of two rak`at.
`Uthman in the early days of his caliphate did the same, but
later on he started praying the full prayer.
2.189:
Narrated Haritha bin Wahab: The Prophet I led us in the prayer
at Mina during the peace period by offering two rak`at.
2.190:
Narrated `Abdur Rahman bin Yazid: We offered a four rak`at
prayer at Mina behind Ibn `Affan . `Abdullah bin Mas`ud was
informed about it. He said sadly, "Truly to Allah we belong
and truly to Him we shall return." And added, "I prayed two
rak`at with Allah's Apostle at Mina and similarly with Abu
Bakr and with `Umar (during their caliphates)." He further
said, "May I be lucky enough to have two of the four rak`at
accepted (by Allah)."