‘Anas (radhi-yallaahu ‘anhu) used to pray until his feet swelled with blood, as a result of elongating his prayer, standing [in prayer] at night.
Safwaan ibn Saleem used to stand in prayer on the roof on a cold night so that he is not overcome by sleep.
In this world, nothing more desirable has remained than prayer in congregation, & [subsequently] meeting the brothers.
I have not seen any better prayer than that of Muhammad ibn Nasr. A house fly settled upon his ear, and he did not [even] try to brush it away. And we were amazed at the gracefulness of his prayer, and his concentration and state; He would place his chin upon his chest and then stand upright as if he was an erect piece of wood.
When Ibraaheem at-Teemee would prostrate, little birds would [descend and] settle upon his back, as if he was a wooden fence.
Sa’eed ibn ‘Abdul-‘Azeez used to stand the night in prayer, and when the time of Fajr entered he would renew his wudhoo and leave [home] for the masjid.