Early and classical Sunni sources preserve reports that al-Ala ibn al-Hadrami may Allah be pleased with him invoked Allah when entering or crossing the sea. Ibn Abi Shaybah preserves an early report with part of his supplication, while fuller Abu Hurayra routes say that al-Ala and his army crossed the water together after invoking Allah. Those fuller versions add that the water barely wet, or did not wet beyond, the lower parts of the camels' hoof-coverings. The early prayer-and-crossing core has meaningful support, but the fuller army and minimal-wetting details depend on routes with material limitations, so the event is best included with caution.
Fuller classical reports add the army setting. In the Abu Hurayra route preserved by al-Tabarani and Abu Nu'aym, al-Ala and his force are described as crossing the water together after invoking Allah. These versions add a striking detail about how little the water affected them: one route says that it did not wet beyond the bottoms of the camels' hoof-coverings. In the fuller al-Lalaka'i version, the wording becomes stronger and says that neither feet nor hooves were wetted. Those formulations should remain attached to their own routes rather than being merged into one exact quotation.
The source layers are not equal in strength. Ibn Abi Shaybah's Musannaf gives the earliest verified prayer-and-sea-crossing locus. The fuller Abu Hurayra route has substantial classical support, but al-Haythami notes that one narrator, Ibrahim ibn Ma'mar al-Harawi, was unknown to him, while the remaining men were trustworthy. Al-Lalaka'i preserves an even fuller narrative, including an army of four thousand, but that chain contains Adi ibn al-Fadl, whom the hadith critics judged abandoned.
For that reason, the strongest public account should distinguish the early core from the fuller extraordinary details. The evidence supports a classical report that al-Ala invoked Allah during a sea crossing and that later reports describe his army crossing with him. The minimal-wetting details are part of those fuller routes, not an equally strong element of the earliest report. The event therefore has meaningful classical support as a companion karamah and accepted prayer, but the source limitations justify medium confidence and inclusion with caution rather than an unqualified claim that every later detail is equally authenticated.
Conclusion
Classical Sunni sources preserve a report that al-Ala ibn al-Hadrami invoked Allah during a sea crossing and that fuller reports describe his army crossing with him in an extraordinary manner. The early core has meaningful support, while the strongest no-wetting details rest on more limited routes, supporting medium-confidence inclusion with caution.