Who did the prophet first call to Islam - Abu Bakr or the Quraysh leadership?

In a Nutshell:  The leaders and elites of Quraysh were the first set of people the Prophet (saw) proactively called to Islam. Abu Bakr heard rumours of these attempts, so went and asked the Prophet (saw) about his call and revelation. After the prophet's explanation and invitation to believe in God and the truth of his call, he believed in him. Quraysh Leadership When the Prophet first received the revelation, he was not asked to convey it by Allah - that came to a short while later. Khadija (ra), his wife, was the first person to believe his claims. She did not receive dawa or an invitation to believe from the Prophet (saw), rather tried to console him during his confusion explaining that he had probably experienced an angel rather than a demon. After a consultation with her cousin Waraqah, that he was a prophet ], thus the first believer before the Prophet even started calling to Islam. By chance, Ali (ra) then saw the Prophet (saw) and Khadija (ra) praying, asking the Prophet (saw) about what he saw, and believing in him. When Allah later asked his Prophet (saw) to start calling people to Islam, he was told to start with his clan and familial relatives.  Allah says: وَأَنذِرْ عَشِيرَتَكَ الْأَقْرَبِينَ   "And warn, (O Muhammad), your closest kindred." (Qur'an 26:214) The Prophet (saw) did not start calling for a social reorientation to Islam or individual change before this verse was revealed - it was only after this verse he started his activism with Quraysh elites. His first step appears to be working with Ali (ra) to prepare a banquet for members of his clan (Banu Abd al-Muttalib), not once but three times. Ali cooked the meal and invited about forty men. The Prophet (saw) when given the opportunity to speak, invited them to accept him as a messenger and collectively follow Islamic as a clan. When this attempt failed, he (saw) went to mount Safa and called the clans of Quraysh collectively asking them to believe in him and accept his call. During these two events, Abu Bakr was away on a trade journey; on his return, he heard rumours about his friend Muhammad (saw) claiming to be a prophet and critiquing the Quraysh elites and their way of life. Abu Bakr asked him about this and the Prophet (saw) explained Allah had ordained him as a prophet and presented the revelation to him. Abu Bakr (ra) after pondering on his claims, believed him without hesitation. Abu Bakr could not have believed in him before his call to the Quraysh leaders because he converted following hearing rumours of the Prophet's (saw) address to them. A similar pattern can be discerned with all the evidences narrated about the conversions of the companions. Conclusion The Quraysh elites were the first and only people whom the Prophet (saw) proactively called to Islam. Everyone else believed in him through rumours that followed this call. Abu Bakr heard rumours of attempts the Prophet (saw) was making with the Quraysh elites, so went and asked him about his new faith and trajectory. He thereby believed in him and converted. References Ibn Kathir, as-Seera al-Nabawiyah  Ibn Hisham, as-Seera al-Nabawiyah  Ibn Ishaq, as-Siyar wa al-Maghazi  Tabari, Tarikh at-Tabari  Ya'muri, 'Uyun al-Athar  Kinani, al-Mukhtasar al-Kabir  Ibn al-Athir, al-Kamil fi at-Tarikh  Sohili, al-Rawd al-Aneef  Ibn Hiban, as-Seera al-Nabawiyah wa Akhbar al-Khulafa  Bayhaqi, Dala'il al-Nubuwah  Dhahabi, Tarikh al-Islam  Darami, as-Seera al-Nabawiyah.