‏الصلاة : Hadeeth No:1513 Anas reported: When the Prophet of Allaah (sallAllaahu alayhi wa sallam) intended to combine two prayers on a journey, he delayed the noon prayer till came the early time of the afternoon prayer, and then combined the two....

‏الصلاة : Hadeeth No:1596 'A'isha reported: When the Messenger of Allaah (sallAllaahu alayhi wa sallam) grew bulky and heavy he would observe (most of his Nafl) prayers sitting....