The Rightly Guided Caliphs (میرا اور میرے خلفاے راشدین کا طریقہ)
The Sunnah of the Khulafa is not just a repetition of the sunnah of the prophet but additionally their inferences too with different applications. So if his successors were righteous their inferences and deductions should also be followed if they prove that they stemmed from the sunnah of the prophet.