Ibn Harmalah narrates that a man asked Sa'id bin al-Musayyib, he said: "I have made a vow that I will walk to the House of Allah (the Ka'bah) on foot." So Sa'id said: "Did you use the word 'vow' (nadhar)?" He replied: "No!" So Sa'id said: "Nothing is obligatory upon you."
Hadith Referenceسنن الدارقطني / النذور / 4322
Hadith Takhrij«أخرجه الدارقطني فى ((سننه)) برقم: 4322، وعبد الرزاق فى ((مصنفه)) برقم: 15880، وابن أبى شيبة فى ((مصنفه)) برقم: 12474، 12559»