Musannaf Ibn Abi Shayba 1:486

Hushaym ibn Bashir narrated to us, from al-A'mash, from Habib, from Sa'id ibn Jubayr, from Ibn Abbas. And Hajjaj, from Ata, from Ibn Abbas, that he did not see [the necessity of] wudu' [ablution] in [the act of] kissing.