I never saw the Messenger of Allah ﷺ pray the Maghrib prayer until he had broken his fast, even if only with a sip of water.
ما رأيت رسول الله ﷺ قط صلى صلاة المغرب حتى يفطر، ولو على شربة من ماء.
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Abu Yaala (3792) narrated it, and from him Ibn Hibban (3504), from Abu Bakr bin Abu Shayba, who said, Husayn bin Ali Jafi told us, from Zaida, from Humayd, from Anas, and he related it. Its chain of transmission is sahih. Husayn bin Ali is Ibn Walid Jafi, who is trustworthy and among the men of the Sahih.Ibn Khuzayma (2065) also narrated it through two routes, from Muhammad bin Mahriz, from Husayn bin Ali with his chain, and from Zakariya bin Yahya bin Aban, who said, Miskin bin Abdul-Rahman Tamimi told us, Yahya bin Ayub told me, from Humayd Tawil, from Anas, but with this wording, "The Messenger of Allah ﷺ, when he was fasting, would not pray until we brought him fresh dates and water, and he would eat and drink when fresh dates were available. In winter, he would not pray until we brought him dried dates and water."Through the second route, Tabarani also narrated it in Awsat, and said, "No one narrated it from Humayd except Yahya, and no one narrated it from him except Miskin, and Zakariya alone transmitted it." Haythami said in Majma al-Zawaid (3/156), "Tabarani narrated it in Awsat, and it contains someone I do not recognize."Ibn Khuzayma (2063) then narrated it through two other routes, Shuayb bin Ishaq and Qasim bin Ghasn, both from Saeed bin Abu Aruba, from Qatada, from Anas, and he related it with the same wording as the first version. Qasim bin Ghasn is daif by the agreement of the scholars. Ibn Hibban said in Majruhin (875), "He was among those who transmitted objectionable reports from well-known narrators, and who reversed chains of transmission, raising disconnected reports to the status of connected ones, and turning stopped reports into ascribed ones. It is not permissible to rely on him when he narrates alone, but as for what agrees with what trustworthy narrators report, if someone considers it for corroboration, I see no harm in that."I say, Shuayb bin Ishaq agreed with him, and he is Ibn Abdul-Rahman Umawi Dimashqi, who is trustworthy and among the men of the Sahih. Hakim (1/431) narrated it from Ibn Khuzayma through the route of Shuayb bin Ishaq with his chain, similarly. Bazzar narrated it in Kashf Astar (984) through another route from Qasim bin Ghasn with his chain, similarly, and said, "We do not know it with this wording except through this chain. Qasim is weak in hadith, and we only record from his hadith what we do not preserve from others." End of quote.It appears from his statement that he had not come across the narration of Shuayb bin Ishaq, for otherwise he would not have recorded it from the hadith of Qasim bin Ghasn.