The validity of the camel driver's Hajj

It is narrated from Ata' (may Allah have mercy on him) that a man asked Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both): "I hire myself out to these people (in their service) and also perform the rites of Hajj along with them; will I receive reward for it?" He (may Allah be pleased with him) said: "Yes (for the statement of Allah, the Mighty and Majestic, is): 'Those will have a share of what they have earned' [Surah al-Baqarah: 202]."

It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that Abu al-Salil submitted to him: "I have some mounts which I rent out at the time of Hajj, and in this way I strive to provide for my family; but some people claim that my Hajj will not be (accepted) because I hire out these mounts." At this Ibn Umar (may Allah be pleased with them both) said: "Those people have spoken falsely. You will receive the reward of your Hajj, and also a reward for your labour and toil for your family; thus for you there is a double reward."
Imam Abu Dawud narrated this hadith through another route, with wording other than this.