Reference: at-Tahajjud wa Qiyaam al-Layl – Page 96
Abu Ishaaq as-Subay’ee said:
My health has forsaken me, and I have become weak, and my bones are bruised, [yet] today I [still] stand for prayer, but am only able to recite [soorahs] al-Baqarah and Aal-‘Imraan.