Sa‘īd ibn al-Hārith asked Jābir ibn ‘Abdullāh (may Allah be pleased with him) about making ablution after eating food that was touched by fire, i.e. cooked or grilled or the like, whether it was obligatory or not? Jābir replied that it was not obligatory. Then he cited evidence for that. He said that during the lifetime of the Prophet (may Allah's peace and blessings be upon him) such food was rare. If they happened to find it and eat it, they didn't have napkins to wipe away the grease; rather, they would lick their fingers then rub them in their palms, forearms, and feet. Then they would pray without making a new ablution.
.دليل الفالحين لطرق رياض الصالحين، لابن علان، نشر دار الكتاب العربي. نزهة المتقين شرح رياض الصالحين، نشر: مؤسسة الرسالة، الطبعة: الرابعة عشر، 1407ه 1987م. بهجة الناظرين شرح رياض الصالحين، للهلالي، نشر: دار ابن الجوزي. صحيح البخاري، نشر: دار طوق النجاة (مصورة عن السلطانية بإضافة ترقيم ترقيم محمد فؤاد عبد الباقي)، الطبعة: الأولى، 1422ه.