Jamieson, Fausset and Brown on Deuteronomy 26:5

5. thou shalt say ... A Syrian ready to perish was my father--rather, "a wandering Syrian." The ancestors of the Hebrews were nomad shepherds, either Syrians by birth as Abraham, or by long residence as Jacob. When they were established as a nation in the possession of the promised land, they were indebted to God's unmerited goodness for their distinguished privileges, and in token of gratitude they brought this basket of first-fruits.