T 1 Cic. Fam. 9.16.7 [ad Papirium Paetum]
Hirtium ego et Dolabellam dicendi discipulos habeo, cenandi magistros; puto enim te audisse, si forte ad vos omnia perferuntur, illos apud me declamitare, me apud illos cenitare.
T 2 Cic. Fam. 7.33.1–2 [ad Volumnium Eutrapelum]
quod declamationibus nostris cares, damni nihil facis. quod Hirtio invideres nisi eum amares, non erat causa invidendi, nisi forte ipsius eloquentiae magis quam quod me audiret invideres....  ... nam et Cassius tuus et Dolabella noster, vel potius uterque noster, studiis iisdem tenentur et meis aequissimis utuntur auribus.
T 3 Quint. Inst. 12.11.6
= 160 T 1.On January 1, 43 BC, in the Senate (F4)
F 4 Cic. Phil. 5.1
= 160 F 3.
Cicero’s treatise De Fato. In 45 BC Hirtius countered criticism of Cicero that the latter’s nephew was spreading (Cic. Att. 13.37.2).
T 1 Cicero, Letters to Friends [to Papirius Paetus]
I have Hirtius and Dolabella [P. Cornelius Dolabella (173), T 1] as pupils in oratory, but as masters in gastronomy. For I believe you have heard, if by chance, all news is brought to you, that they practice declaiming at my house, and I practice dining at theirs.
T 2 Cicero, Letters to Friends [to Volumnius Eutrapelus]
In missing my declamations, you lose nothing at all. As for your envying Hirtius, if you were not so fond of him, there would be no cause for envy, unless perhaps you envied him his eloquence rather than that he listens to me....  ... For both your friend Cassius [C. Cassius Longinus] and our friend Dolabella [P. Cornelius Dolabella (173), T 2], or rather “our” in both cases, are devoted to the same pursuits and make use of my very well-disposed ears.
T 3 Quintilian, The Orator’s Education
= 160 T 1.On January 1, 43 BC, in the Senate (F 4)
In his consular year (43 BC), Hirtius spoke in the Senate (F 4) until he left Rome to fight against M. Antonius (159).
F 4 Cicero, Philippics
= 160 F 3.