The term "Sharh Hanafiyah" is a generic title for any commentary on a Hanafi text. If page 89 is critical for your research, you might be looking for one of these specific major commentaries: Sharh Ma'ani al-Athar by Imam al-Tahawi. Radd al-Muhtar (often called Hashiyat Ibn Abidin ). Al-Bahr al-Ra'iq by Ibn Nujaym.
Consider modern Fatwas about Qada (making up missed prayers). If the default of a command is immediacy, then delaying a prayer without excuse is a sin. But if the default were permissibility of delay, then praying at the last minute would be equal to praying at the first minute. Page 89 provides the balanced Hanafi view: The obligation is immediate in respect to its cause , but the performance window is a mercy. sharh hanafiyah page 89