(3) باب مَا يُكْرَهُ مِنْ كَثْرَةِ السُّؤَالِ وَتَكَلُّفِ مَا لاَ يَعْنِيهِ
Narrated Anas:
We were with `Umar and he said, "We have been forbidden to undertake a difficult task beyond our capability (i.e. to exceed the religious limits e.g., to clean the inside of the eyes while doing ablution).
Reference: Sahih al-Bukhari 7293
In-book reference: Book 96, Hadith 24
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 92, Hadith 396