One or two strikes in tayammum: Abu Hanifah said two strikes, and one strike does not suffice him

Sayyiduna Urwah al-Bariqi (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) gave him a dinar so that he might buy a goat with it. He bought two goats with it, then sold one of the goats for a dinar, and brought the Prophet (peace and blessings be upon him) a goat and a dinar, so he (peace and blessings be upon him) prayed for blessing for him in his purchase. After that, if this Companion bought even dust, he would make a profit on it.

It is narrated from Sayyiduna Hakim bin Hizam (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) sent him to buy a sacrificial animal for one dinar. He bought the sacrificial (animal), then sold it for two dinars, then bought a goat for one dinar and came to him (peace and blessings be upon him) with a dinar (as well). So he (peace and blessings be upon him) prayed for blessing for him and ordered him to give the dinar in charity. It is mentioned that the view of (Imam) Abu Hanifah is: When an agent sells without the order of the one who appointed him, he is liable.