A man who says 'I must walk to the House' without saying 'I vow to walk to the House of Allah or the Kabah': is it binding on him?

Sayyiduna Ibn Umar (may Allah be pleased with them both) was asked about a man who says, 'Walking to the Ka'bah is due from me.' He said: This is a vow; he should walk.

Muhammad bin Hilal said: I heard Sa'id bin al-Musayyib say: Whoever says, 'Walking to the House of Allah is due from me,' it is nothing, unless he says, 'A vow to walk to the Ka'bah is due from me.'

Hisham bin Urwah said: A man among us said, 'Walking to the House of Allah is due from me in a certain matter.' Then he came to al-Qasim and asked him about it, and he said: He should walk to the House of Allah.

Ibrahim al-Taymi said: When a man says, 'For Allah, it is due from me,' or 'A Hajj is due from me,' the two are the same; and when he says, 'A vow is due from me,' or 'It is due from me for Allah,' the two are the same.

Umar bin Zayd said: Two men came to al-Qasim and asked him, while I was listening, about a man who had said, 'Walking to the House of Allah is due from me.' He asked: Did he make a vow? They said: No. He said: Then he should expiate his oath.